Information Technology Reference
In-Depth Information
g722-56 G722-56K 64000 bps - Only supported for H.320<->H.323 calls
g722-64 G722-64K 64000 bps - Only supported for H.320<->H.323 calls
g723ar53 G.723.1 ANNEX-A 5300 bps (contains built-in vad that cannot be
disabled)
g723ar63 G.723.1 ANNEX-A 6300 bps (contains built-in vad that cannot be
disabled)
g723r53 G.723.1 5300 bps
g723r63 G.723.1 6300 bps
g726r16 G.726 16000 bps
g726r24 G.726 24000 bps
g726r32 G.726 32000 bps
g728 G.728 16000 bps
g729br8 G.729 ANNEX-B 8000 bps (contains built-in vad that cannot be
disabled)
g729r8 G.729 8000 bps
ilbc iLBC 13330 or 15200 bps
CME_A(config-dial-peer)#
codec g711ulaw
ROUTER_B(config)#
dial-peer voice 1100 voip
ROUTER_B(config-dial-peer)#
destination-pattern 110.
ROUTER_B(config-dial-peer)#
session target ipv4:10.1.1.1
ROUTER_B(config-dial-peer)#
codec g711ulaw
The primary difference between the POTS and VoIP dial peer configuration is the use of
the
session target
command rather than the
port
command. When you use the context-
sensitive help after the
session target
command, the router simply replies with WORD.
This means that whatever you enter after the command is somewhat freeform. Most of the
time, you will use the syntax
ipv4:
<ip address>
to enter a remote IP address, as shown in
Example 6-11. This command also allows you to direct calls to DNS names (by using
dns:
<
name
> syntax) or to a variety of call-management servers, such as H.323 gatekeepers
or Session Initiation Protocol (SIP) proxy servers.
After you set the session target destination, you can optionally use the
codec
command
to select the codec the router should use when placing a call to this destination.
Note:
If the codec values do not match between the two routers, the call fails and returns
a reorder tone (fast busy signal). This is commonly called a codec mismatch. The default
codec value for VoIP dial peers is G.729.
Finally, notice that the dial peer 1100 on ROUTER_B uses the command destination-pat-
tern 110. to direct all calls starting with the digits 110 to the CME_A router. Without this
wildcard, you would need to create two VoIP dial peers on ROUTER_B: one for x1101
and one for x1102.
