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Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide
Lucent Technologies DEFINITY Enterprise Communication Server Release 8.2 Administrators Guide
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DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1567 Trunks and Trunk Groups 20 IP Trunks — Internet Protocol Trunks IP trunks allow DEFINITY ECS to route voice calls and faxes over a local- or wide-area TCP/IP network. Use IP trunks to reduce long-distance charges by routing calls over the Internet or your intranet. NOTE: The origin and destination switches must both have the special hardware and software needed to route telephone calls over IP networks. Refer to ‘‘ IP trunk service’’ on page 1383 for more information. ISDN — Integrated Services Digital Network ISDN trunks are digital trunks that can integrate voice, data, and video signals and provide the bandwidth needed for applications such as high-speed data transfer and video conferencing. ISDN provides end-to-end digital connectivity and uses a high-speed interface that provides service-independent access to switched services. Through internationally accepted standard interfaces, an ISDN provides circuit or packet-switched connectivity within a network and can link to other ISDN-supported interfaces to provide national and international digital communications. ISDN trunks can also efficiently combine multiple services on one trunk group. PCOL — Personal Central Office Line A personal central office line is one dedicated trunk that links a group of phones to the local central office or to another switch in a private network. A PCOL group can have 1–16 phones, and each phone can have one or more appearances for the personal central office line. You may administer a PCOL group as a CO, FX, or WATS trunk group. Use a PCOL line when one or more users need a direct, dedicated connection to the public network or to another switch. Tie Tie trunks connect a switch to a central office or to another switch in a private network. These trunks transmit dialed digits with both outgoing and incoming calls. Thus, incoming calls over a tie trunk can be routed directly to the extension the caller dialed. Tie trunks are frequently used in private networks; in addition, use tie trunks when you want a two-way trunk group with the convenience of direct inward dialing for incoming calls. Tie trunks that connect private network switches are “universal. “This means that the trunks can be administered with a variety of translation encodes. The originating switch can recognize any start dial signal (precise dial tone, wink start, or delay dial) that the terminating switch sends. If the originating switch does not
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1568 Trunks and Trunk Groups 20 receive one of these start dial signals, it can be administered to send digits after an administered interval. (This time-out interval is the amount of time that the originating switch waits before sending digits.) Analog tie trunks The number of tie trunks in a connection and the technology of any multiplex systems used in the facilities affect the maximum data transfer rate. Generally, for transfer rates up to 300 bps, a connection can have 5 tie trunks in tandem. For data rates of 301–2,400 bps, a connection can have up to 3 tie trunks in tandem. For data rates of 2,401–4,800 bps, a connection can have up to 2 tie trunks in tandem. Analog tie trunks used in unswitched connections can support up to 9,600 bps. Digital tie trunks The digital tie trunk is a high-speed and high-volume trunk interface to a T1 or E1 carrier. It uses a digital signal level 1 (DS1) protocol. By multiplexing 24 64-kbps digital channels onto a single 1.544-Mbps T1 carrier, or 32 64-kbps digital channels onto a single 2.048-Mbps E1 carrier, DS1 offers an economical alternative to the analog tie trunk as well as a high-speed fully digital (without modems) connection between the switches. The maximum per-channel data rate for DS1 is 64 Kbps, and DS1 trunks can carry voice, voiceband data, or high-speed data communications. WATS — Wide Area Telecommunications Service Outgoing WATS service allows calls to certain areas (“WATS bands”) for a flat monthly charge. Incoming WATS trunks allow you to offer toll-free calling to customers and employees. Applications for different trunk types To help you select the right type of trunk for a specific application, the following table gives you an overview of key characteristics of different trunk groups. Remember that all analog trunks can carry only voice and voice-grade data.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1569 Trunks and Trunk Groups 20 Transmission and supervisory signaling A trunk is named for its transmission characteristics. For example, trunks are always classified by the direction of the traffic they allow: nOne-way incoming trunk — A local trunk that can be selected (seized) by the far-end connected switch. nOne-way outgoing trunk — A trunk that can be seized by the local switch to call the far-end switch. nTwo-way trunk — A trunk that can be seized by either of the connected switches. Another transmission characteristic is signaling, which is the transmission of supervision, address, alerting, or other switching information. Supervisory signaling establishes or sets up the connection of the local switch to the distant switch. In general, supervisory signaling has 2 phases: nSeizure signal — The originating office’s signal for a request for service from the distant office. Type of trunk DirectionAnalog or Digital? Traffic supportedTransmits digits? CO, FX, WATS Incoming Outgoing Two-wayEither Any kind of voice or data traffic.No CPE N.A. Either Any kind of voice or data traffic.No DID Incoming Either Only voice and voice-grade data.Yes DIOD Incoming Outgoing Two-wayEither Any kind of voice or data traffic.Only for incoming calls PCOL Incoming Outgoing Two-wayAnalog onlyOnly voice and voice-grade data.No Tie, Access Incoming Outgoing Two-wayEither Any kind of voice or data traffic.Yes
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1570 Trunks and Trunk Groups 20 nStart-dial signal — The distant office’s acknowledgment that it is ready to accept dialing from the originating office. Seizure signals Ear & Mouth (E&M) supervision E&M supervision is a symmetric signaling scheme used on private network trunks. DC voltage levels are sent over E&M leads, which are separate from the transmission path. E & M signals indicate on-hook and off-hook states for each end of the connection path. Ear & Mouth (E&M) supervision on digital trunks DIOD trunk groups support Continuous and Pulsed E&M Signaling that allows you to make and receive calls over Brazil pulsed or continuous E&M signaling trunks and Hungarian pulsed E&M signaling trunks. Refer to DEFINITY ECS Application Notes for Type Approval for more information. Ground-start (GS) supervision Ground-start signaling is a supervisory signaling scheme used on public network trunks in which ground is applied on the tip (T) lead by the CO and on the ring (R) lead by the switch. For example, the calling switch on a call to a CO seizes the outgoing trunk by placing a ground on the trunk interface R lead. The CO recognizes the trunk seizure as a request for service and grounds the trunk T lead to indicate to the calling switch that the CO is ready to receive digits. Ground-start signaling is superior to loop-start signaling (described below) for the following reasons: nThe switch can make trunks busy to outgoing calls almost immediately, because the tip ground seizure by the distant switch minimizes the interval during which a two-way trunk can be seized from both ends (called glare). nGround-start signaling allows answer supervision, a positive indication that a distant switch has disconnected from a call. Answer supervision has 2 benefits: — Callers who remain off-hook after completing a call won’t be connected to central office dial tone. For example, this prevents a restricted station from making an unauthorized call after placing an authorized call using the attendant. — By holding the trunk busy until the central office disconnects, another switch cannot seize the trunk and be connected to the CO party of the previous call.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1571 Trunks and Trunk Groups 20 nLoop-start (LS) supervision — A supervisory signaling scheme used between a telephone and a switch in which the telephone or far-end office completes the current path formed by the trunk wires. The circuit provides one signaling state when it is open and another when it is closed. A third signaling state is achieved by changing the direction or magnitude of current in the loop. The preferred method of loop-start signaling is reverse battery signaling. Disconnect times when using loop-start signaling can result in delays of up to 10–20 seconds. Glare, as described in ground-start, is possible. Loop-start signaling does not provide answer supervision. This lack can open a potential for toll fraud in some situations, especially when incoming calls are forwarded off-net. Loop-start is used with analog DIOD trunks, but in general try to use loop start only with one-way trunks. nReverse Battery (RB) supervision — A supervisory technique on one-way trunks that uses open and closure signals from the originating end and reversals of battery and ground from the terminating end (normally used on direct inward dialing trunks). Start-dial signals Network trunks operate as automatic, immediate start, dial tone, wink start, or delay dial according to the type of start-dial signal (alerting) the switch sends out or expects to receive. The different transmissions of alerting are: nAutomatic — The originating switch sends no digits or start dial signal and expects the terminating switch to complete the call. The call usually is completed by the attendant or other service such as Centralized Attendant Service (CAS). nImmediate start — The originating switch sends digits immediately without waiting for a start dial signal from the terminating switch. nDial tone — The terminating switch sends precise dial tone to the originating switch. This indicates that the terminating switch is ready to receive digits. nWink start — The terminating switch sends a wink start (momentary off-hook) signal to the originating switch. This indicates that the terminating switch is ready to receive digits. nDelay dial — The terminating switch sends a delay dial signal (an off-hook signal followed by an on-hook signal) to the originating switch. This indicates that the terminating switch is ready to receive digits.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1572 Trunks and Trunk Groups 20 Types of address transmission In addition to seizure and start dial signals, switches have to transmit the digits and characters for telephone numbers. This is called address transmission. Three types of signaling are available: nDial Pulse (DP) addressing — A method of signaling that consists of regular momentary interruptions of a direct or alternating current at the sending end. The number of interruptions corresponds to the value of a digit or character (alternating current is not used by switches). The interruptions usually are produced by a rotary telephone dial, or may be produced by a sender in a switching system. nDual Tone Multifrequency (DTMF) addressing — Signaling arrangements (commonly known as touch-tone) that consist of two, simultaneous, dialing signals. One tone is from a low group of four frequencies. The other tone is from a high group of four frequencies. Both tones correspond to digits, letters, or characters (0–9, A–Y, or * and #). One of the tones (1,633 Hz) from the high group is a spare. nMultifrequency (MF) addressing — Signaling arrangements that make use of only 2 frequencies out of 6 to represent 10 decimal digits (0– 9) and 5 auxiliary signals. MF signals are used for called number addressing, calling number identification. They also report whether the far end is ringing or busy. Analog vs. digital trunks Analog trunks carry voice and voiceband data communication. “Voice” means that sound of any kind is transformed into electrical waveforms and transmitted within an approximate bandwidth of 300 Hz to 3,400 Hz. “Voiceband data” means that data is transmitted within the voiceband and requires a conversion resource (modem) at both ends of the connection. The data-transmission rate for analog trunks depends on the data-handling capability of the modems in the connection. Digital trunks represent both sound and data as 0’s and 1’s and can be configured to carry any kind of voice or data traffic. Digital trunks connect to a DS1 circuit pack and provide a T1 or E1 carrier. DS1 service provides an interface for CO, FX, DID, tie, and WATS trunks. The DS1 interface supports incoming and outgoing dial types of ground-start, loop-start, auto/auto, auto/delay, auto/immed, and auto/wink. Signaling may be robbed-bit or common-channel depending on the trunk type and whether the dial-type is incoming or outgoing. The interface may be used to connect the switch to a toll office directly using wink-start tie trunks for two-way access to the toll network. Supervision, addressing, and alerting methods have been carried over to digital trunks, which use basically the same signaling scheme as analog trunks when establishing a call. These schemes are handled in a variety of ways to indicate
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1573 Voice Message Retrieval 20 particular calling states, such as on-hook, off-hook, ringing, not ringing, and so on, by using A and B bit-timed signaling. A and B bits carry a 0 or 1 depending on the type of trunk, the near-end channel unit type, far-end channel type, the condition of the trunk (open loop, loop closure, reverse battery, and so on), and whether it is transmit or receive signaling. In addition to the above, refer to ‘‘ DS1 Circuit Pack’’ on page 599 for trunk-related terms associated with DS1 trunk interfaces. Interactions nBrazil Block Collect Call In both continuous and pulsed E&M signaling, Block Collect Call is not included. nPersonal Central Office Line (PCOL) PCOL trunks cannot use continuous, pulsed, or discontinuous E&M. Related topics Refer to the DEFINITY ECS System Description for information on the types of circuit packs available and their capacities. This manual also lists the maximum number of trunks and trunk groups for each system configuration. Refer to ‘‘ Managing trunks’’ on page 337 for administration procedures. Refer to ‘‘ DS1 Trunk Service’’ on page 1317 for detailed information on Digital Signal Level 1 trunk service. Refer to ‘‘ IP trunk service’’ on page 1383 for detailed information about sending voice calls over IP networks. Refer to ‘‘ ISDN service’’ on page 1394 for detailed information about Integrated Services Digital Network trunks. Voice Message Retrieval Voice Message Retrieval allows attendants, phone users, and remote-access users to retrieve Leave Word Calling (LWC) and Call Coverage messages.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1574 Voice Message Retrieval 20 Detailed description Voice Message Retrieval is only used for the retrieval of messages. When a terminal is in Voice Message Retrieval mode, it cannot be used to make calls or access other features. Voice Message Retrieval can be used to retrieve your own messages or messages for another user. However, a different user’s messages can only be retrieved by a user at a phone or attendant console in the coverage path, by an administered system-wide message retriever, or by a remote-access user when the extension and associated security code are known. The number of simultaneous Voice Message Retrieval users possible depends on the number of speech-synthesizer circuit packs used in the system. Certain phones and attendants can be designated for system-wide message retrieval. These system-wide retrievers are the same as those used for Display Message Retrieval and have the same privileges. Voice Message Retrieval cannot be accessed from rotary phones. You can use the system to restrict unauthorized users from retrieving messages. Use the Lock function to restrict a phone and the Unlock function to release the restriction. Users activate Lock by dialing a system-wide access code. They cancel Lock by dialing a system-wide access code and then an Unlock security code unique to the phone. These functions only apply to the phone where the function is active. The system-wide access codes and security code used for the Lock and Unlock functions are the same as those used for LWC message retrieval by display. You can assign a status lamp to show the lock status of the phone. Interactions nAUDIX Interface Retrieval of LWC messages via Voice Message Retrieval is separate and distinct from retrieval of messages via INTUITY. LWC messages left for a principal on AUDIX cannot be accessed via Voice Message Retrieval. However, the caller of Voice Message Retrieval is informed of any new messages for the principal on AUDIX: — The Voice Message Retrieval voices that there are AUDIX messages. — The Display Message Retrieval displays “Message Center AUDIX Call.” If your system has a voice-synthesizer circuit pack and LWC Activation is active, users can retrieve messages from two locations: — Users can retrieve LWC messages with Voice Message Retrieval. — Users can retrieve all other messages with AUDIX.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1575 Voice Message Retrieval 20 If you do not have a TN725B speech-synthesizer board, non-display phone users cannot retrieve LWC messages sent via the LWC button on a phone. nBridged Call Appearance Voice Message Retrieval on a Bridged Call Appearance functions the same as if it were activated by the primary extension associated with the bridged call appearance. nLeave Word Calling Voice Message Retrieval enhances LWC by allowing any authorized touch-tone phone user to retrieve messages. Related topics Refer to ‘‘ Audible Message Waiting’’ on page 1152 for information about letting users know they have messages. Refer to ‘‘ Feature Access Code’’ on page 619 for information about and field descriptions on the Feature Access Code screen. Complete the LWC Message Retrieval Lock, LWC Message Retrieval Unlock, Voice Coverage Message Retrieval Access Code, and Voice Principal Message Retrieval Access Code fields on this screen to administer voice message retrieval. Refer to ‘‘ Feature-Related System Parameters’’ on page 632 for information about and field descriptions on the Feature-Related System Parameters screen. Complete the Stations With System-Wide Retrieval Permission and Message Waiting Lamp Indicates Status For fields on this screen to administer voice message retrieval. Refer to ‘‘ Station’’ on page 882 for information about and field descriptions on the Station screen. Complete the Security Code field on this screen to administer voice message retrieval.
DEFINITY ECS Release 8.2 Administrator’s Guide 555-233-506 Issue 1 April 2000 Features and technical reference 1576 Voice Messaging Systems 20 Voice Messaging Systems DEFINITY ECS supports several Lucent voice or multimedia messaging systems. These systems allow users to send, retrieve, store, and forward messages, as well as perform many other tasks associated with messages. In addition to supporting multiple AUDIX systems, DEFINITY can have multiple hunt groups associated with a single AUDIX system. This allows partitioning of the voice ports into different hunt groups and different coverage paths to cover different voice ports. Thus voice ports can be reserved for particular users or groups of users (for example, those that use unique coverage paths). The following features do not use coverage paths: nTransfer into AUDIX with the feature access code or the GOTO COVER button nLast Call If a local AUDIX and a remote AUDIX use the same hunt-group numbers, calls route to the local hunt group.