Multi-Tech Systems Voice Over IP A Primer For Resellers Instructions Manual

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.9
Latency is defi ned as the average “travel” time it takes for a packet to pass through the network, from 
source to destination. The average time varies according to the amount of traffi c being transmitted and 
the  bandwidth  available  at  that  given  moment.  If  the  traffi c  is  greater  than  the  bandwidth  available, 
packet delivery will be delayed.
MultiVOIP  deals  with  the  latency  issue  in  a  private  network  as  well...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.10
MultiVOIP  also  utilizes  Bad  Frame  Interpolation  to  increase  voice  quality  by  making  the  voice 
transmission more robust in bursty error environments. It interpolates lost/corrupted packets by using 
the previously received voice frames. Interpolation of one or two voice packets will not cause a noticeable 
degradation  in  voice  quality. Typically,  Bad  Frame  Interpolation  is  invoked  if  Forward  Error  Correction...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.11
Ease of Use
“Will my users require extensive training to use the MultiVOIP system?”
No, placing calls with MultiVOIP is like using your existing phone system. It uses single-stage dialing by 
utilizing a Uniform Dialing Plan that is consistent with the E.164 (PSTN) standard numbering plan. This 
includes  automatic  appending  and  stripping  of  digits  to  dialed  numbers  to  ensure  that  users  will  not 
require additional training...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.12
Port Confi guration
“How do I determine the number of ports I need and which MultiVOIP to order?”
You do not need a port for every telephone on the PBX system. You simply need to determine the calling 
ratio to determine how many ports you need at each location. The following guidelines can help you:
1)  If  you  are  replacing  tie/trunk  lines,  for  every  line  that  you  support  you  need  one  port  on  the 
MultiVOIP.
Ex.  4 Tie...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.13
Voice over IP Applications
MultiVOIP  is  ideal  for  multi-location  businesses  looking  to  reduce  toll  charges  associated  with  intra-
offi ce  calling.  It  is  designed  to  help  a  company  maximize  investments  they’ve  already  made  in  their 
data network infrastructure and voice equipment. Using our company example, the following are some  
of the many applications for a VOIP network:
Offi ce-to-Offi ce Communication
A...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.14
Wireless Connections
To  extend  a  customer’s  PBX  to  a  building  across  the  street,  utilize  a  wireless  bridge  to  connect  the 
two networks. Now, your customer has voice and data connectivity without laying cables or paying 
monthly  charges  for  dedicated  lines.  Building  off  our  example VOIP  network,  we  have  now  added  a 
wireless connection to the company’s warehouse.
Wireless Building-to-Building 

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.15
Confi guring a MultiVOIP Network
Now that you have a basic understanding of Voice over IP, the MultiVOIP gateway, and its applications, 
the  next  step  is  to  learn  how  easy  it  is  to  confi gure  the  solution  around  existing  telephone  and  data 
networks.
Confi guring the Telephony Interface
Let’s fi rst discuss how to confi gure the MultiVOIP gateway to the various telephony options. We will look 
at both the analog and...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.16
Key Telephone System and PBX Interface Options:
1.FXS interface - Use this interface when connecting the line side (CO port) of your key telephone 
system or PBX to the MultiVOIP gateway. The system will act similarly to connecting directly to 
a CO line. Here’s how it works:
Outgoing calls: The caller needs to access the MultiVOIP gateway in order to receive a dial tone.  
An  easy  approach  would  be  to  associate  a  button  on  the...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.17
Building the VOIP Dialing Plan
MultiVOIP provides single stage dialing by utilizing a Uniform Dialing Plan that is consistent with both 
the  PBX  and  the  E.164  (PSTN)  standard  numbering  plan.    This  means  placing  calls  is  like  using  your 
existing phone system, no user training is needed.
In order to accomplish this, MultiVOIP utilizes an Inbound and Outbound phonebook.  In our company 
example,  the  system  allows...

Copyright © 2003 Multi-Tech Systems, Inc.  All rights reserved.18
When  confi guring  the  MultiVOIP  gateway 
for  the  network,  you  must  identify,  within 
the  software,  its  IP  address,  subnet  mask, 
and gateway address. The IP address is your 
unique LAN IP address. The subnet mask is 
the number that identifi es the sub network 
to  which  your  MultiVOIP  is  connected.  The 
gateway  address  is  the  IP  address  of  the 
device  connecting  your  MultiVOIP  to  the 
Internet/intranet....