Panasonic Kx Tda0490 Getting Started Manual
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A1 VoIP Requirements Getting Started 51 Is there only a single IP network between 2 ends of a call? A huge degradation in speech quality will be produced when calls are made through multiple IP networks as shown below; therefore, it is recommended that you avoid establishing a VoIP network in this fashion. IP Network 1IP Network 2 PSTN IP Network 1IP Network 2
A1 VoIP Requirements 52 Getting Started Is the card located appropriately? Transmission delays can cause pauses and loss in VoIP communications. The more network devices (e.g., routers and switches) there are between the communicating cards, the larger the transmission delays, because a certain amount of delay is inevitable when packets go through each network device (hop). One preventative measure is to install the card so that the number of transmission hops is kept to a minimum. In the diagram below, the card is located as close to the IP network interface as possible. A1.3 Network Devices You must evaluate the network devices that are used in the existing network to see if a VoIP network can be implemented. Below are the points that should be taken into your evaluation. Can the firewall pass packets from the VoIP Gateway Card? If the VoIP network contains a firewall, the firewall must be configured appropriately to allow VoIP packets, which are listed in the table below, to pass through the network without being blocked by filtering. For more information, consult your network administrator. Protocol TCP/UDP Default Port No. HTTP *1TCP 80 RTP/RTCP *2UDP 5004 to 5035 H.225.0 Call Signaling *2TCP 1720 H.245 *2TCP 1712 to 1724 H.225.0 RAS *2UDP 1719 QSIG Connectionless Tunneling *1TCP 1718 *1 For the actual setting values, refer to 2.2.1 Network Parameters in the VoIP Gateway Card Programming Guide. Router Switch Too many hops Switch HubRouter SwitchBetter (PBX located nearest IP network access point) Switch Hub
A1 VoIP Requirements Getting Started 53 Are layer 2 or higher switches used? Use of repeater hubs can increase the network load, and therefore will result in degradation in speech quality. To ensure high speech quality, use only layer 2 or higher switches. Note Also note that the port of the switch that connects to the card should be set to operate under Auto Negotiation mode. This will help assure error-free communication between the card and the switch. Are Category 5 (CAT5) cables used? When connecting network devices, make sure to use CAT5 cables. If other types of cables are used, communications may not be carried out normally. A1.4 QoS (Quality of Service) Some routers permit the configuration of priority control features. This allows the router to give higher priority to voice packets and lower the rate of loss and delays during transmissions, hence improving speech quality. It is strongly recommended that you use this feature, especially in networks where traffic is heavy. Typically, a router identifies what packets to pass in priority by checking the value in the ToS field of the header of IP packets. The VoIP Gateway Card has the ability to set the ToS field of outgoing voice packets (see 2.2.3 Voice Communication Parameters in the VoIP Gateway Card Programming Guide). When the card is appropriately configured, the router can give voice packets from the card higher priority. Consult your network administrator when setting the ToS field, as the setting value must conform to the routers specifications. Note Some switches also permit the configuration of priority control features. For more information, consult your network administrator. *2 For the actual setting values, refer to 2.2.2 H.323 Parameters in the VoIP Gateway Card Programming Guide.
A2 VoIP Requirements Checklist 54 Getting Started A2 VoIP Requirements Checklist Use the following checklists to see if you can implement a VoIP network. The answers identified in underlined bold-face letters are the required answers for the corresponding questions. Bandwidth Assessment Network Configuration No. Question Answer Memo Ref. 1Does the network have enough bandwidth to support VoIP communications? Make sure that there is more bandwidth available for VoIP communications than the amount actually required. Ye s No IP network bandwidth =kbps Available bandwidth for VoIP =kbps Required bandwidth for VoIP =kbpsp. 46 No. Question Answer Memo Ref. 2-aIs the IP network a managed network? Make sure to use a managed IP network such as Frame Relay, Leased Line, or IP-VPN (Virtual Private Network). The VoIP Gateway Card is not intended for use on the Internet (including an Internet VPN). Ye s NoType of IP network: p. 48 2-bIs it possible to have static IP addressing? Ye s Nop. 49 2-cIs network address translation (NAT/NAPT) disabled? Ye s Nop. 49 2-dDoes only a single router provide access to the IP network? Ye s Nop. 50 2-eIs there only a single IP network between 2 ends of a call? Ye s Nop. 51 2-fIs the card located appropriately? Ye s NoNo. of hops (routers/switches) within one location: p. 52
A2 VoIP Requirements Checklist Getting Started 55 Network Devices QoS (Quality of Service) No. Question Answer Memo Ref. 3-aCan the firewall pass packets from the VoIP Gateway Card? When a firewall is used, make sure to configure the firewall appropriately to allow VoIP packets to pass through the network without being blocked by filtering. Ye s NoModel of the firewall: p. 52 3-bAre layer 2 or higher switches used? Do not use repeater hubs as they can increase the network load. Also note that the port of the switch that connects to the card should be set to operate under Auto Negotiation mode. Ye s NoModel of the switch: p. 53 3-cAre Category 5 (CAT5) cables used? Ye s Nop. 53 No. Question Answer Memo Ref. 4Can the router or switch be configured to use priority control features? Ye s NoModel of the router/switch: VoIP Gateway Cards ToS field setting:p. 53
Getting Started 57 Appendix B Alternative Numbering Plan Example
B1 Extension Number Method 58 Getting Started B1 Extension Number Method This section provides a numbering plan example using the extension number method, as supplementary information to the PBX code method discussed in 1.2.2 Numbering Plan Example. B1.1 Example Network The following diagram illustrates a simple VoIP network configured for the extension number method. PSTN(Public Switched Telephone Network) IP Network Chicago Office PSTN Trunk (CO Line) Number: 93 VoIP Gateway Trunk (CO Line) Access Number: 803 PSTN Local Telephone 123-4567 Extn. 301 (300-399) PSTN Trunk (CO Line) Number: 92 VoIP Gateway Trunk (CO Line) Access Number: 802 Extn. 201 (200-299)Local Telephone 456-7890G3 Fax Extn. 501 (500-599) G3 Fax Extn. 601 (600-699) Default Gateway IP: 200.45.11.1Subnet Mask: 255.255.255.0 Card IP: 200.45.11.35 Subnet Mask: 255.255.255.0 Los Angeles Office Default Gateway IP: 199.176.64.1 Card IP: 199.176.64.41
B1 Extension Number Method Getting Started 59 B1.2 Numbering Plan Example IP Addressing Information The following table is a duplication of the table used for the PBX code method. PBX Numbering Information The following table contains VoIP Gateway Trunk (CO Line) Access Number, instead of PBX Code and TIE Line Access Number as used in the PBX code method.Los Angeles OfficeChicago OfficeDescription Card IP Address 200.45.11.35 199.176.64.41Identifies the location of each VoIP Gateway Card in the network during VoIP communications. A unique IP address must be assigned to each card. Default Gateway Address200.45.11.1 199.176.64.1Identifies the IP address of the primary gateway (typically a router or similar device) that exchanges IP packets with the other gateways on the VoIP network. Subnet Mask Address 255.255.255.0 255.255.255.0Defines which digits of an IP address are used for the network address and the host address at each network location. A card IP address must fall within the same subnet as that of the default gateway (e.g., router) that is connected to the card. Los Angeles OfficeChicago OfficeDescription VoIP Gateway Trunk (CO Line) Access Number802 803An access number to seize a VoIP gateway trunk (CO line). PSTN Trunk (CO Line) Number92 93An access number to seize a local PSTN trunk (CO line). Extension Number200 to 299 300 to 399 A number assigned to each extension. Fax Ex te nsi on Number500 to 599 600 to 699 A number assigned to each fax extension.
B1 Extension Number Method 60 Getting Started Dialing Examples With the extension number method, the caller dials only the destination number of the called party to call through PBXs at different locations. Calling from Los Angeles to Chicago To extension 301 via VoIP network To local telephone 123-4567 via VoIP network through local PSTN Calling from Chicago to Los Angeles To extension 201 via VoIP network To local telephone 456-7890 via VoIP network through local PSTN PBX Connection Information Los Angeles Office Chicago Office Extn. FAX Extn. PSTN AccessExtn. FAX Extn. PSTN Access Leading Number 2 5 92 3 6 93 Remaining Digits227227 Card IP Address 200.45.11.35 199.176.64.41 Dial 301. extension no. Dial 93. Dial 802. Dial 123-4567. VoIP Gateway trunk (CO line) access no.phone no.Chicago PBX PSTN trunk (CO line) no. Dial 201. extension no. Dial 92. Dial 803. Dial 456-7890. VoIP Gateway trunk (CO line) access no.phone no.Los Angeles PBX PSTN trunk (CO line) no.