Filter
Top Products
Configure Voice over IP using a Trunk Connection
VC-36
Voice, Video, and Home Applications Configuration Guide
The routers on both sides of the Voice over IP connection must be configured for trunk connections.
For the scenario described in Figure 11, configure Router A to support trunk connections as follows:
configure terminal
voice-port 1/0/0
connection trunk +15105554000
dial-peer voice 10 pots
destination-pattern +13085551000
port 1/0/0
dial-peer voice 100 voip
session-target ipv4:172.20.10.10
destination-pattern +15105554000
For the scenario described in Figure 11, configure Router B to support trunk connections as follows:
configure terminal
voice-port 1/0/0
connection trunk +13085551000
dial-peer voice 20 pots
destination-pattern +15105554000
port 1/0/0
dial-peer voice 200 voip
session-target ipv4:172.19.10.10
destination-pattern +13085551000
To configure virtual trunk connections in Voice over IP, use the connection trunk command. The
following conditions must be met for Voice over IP to support virtual trunk connections:
• Use the following voice port combinations:
— E&M to E&M (same type)
— FXS to FXO
— FXS to FXS (with no signaling)
• Do not perform number expansion on the destination pattern telephone numbers configured for
trunk connection.
• Configure both end routers for trunk connections.
• The connected Cisco routers must be Cisco 2600 or Cisco 3600 series routers. The Cisco AS5300
does not currently support trunk connections.
Note Because virtual trunk connections do not support number expansion, the destination patterns
on each side of the trunk connection must match exactly.
VoIP establishes the trunk connection immediately after it is configured. Both ports on either end of
the connection are dedicated until you disable trunking for that connection. If for some reason the
link between the two switching systems goes down, the virtual trunk re-establishes itself after the
link comes back up.