Cisco UC500 series Configuration Manual page 42

NOTE: All values listed are the maximum for each function – you must mix & match to
get the optimum # of calls that can be supported over the SIP trunk.
4.4.3.2 Using G.729 as the codec on the SIP trunk
UC500 Bandwidth
Model per call
8/16 User 24 Kbps
(PVDM2-32)
24/32/48 User 24 Kbps
(PVDM2-64)
NOTE: All values listed are the maximum for each function – you must mix & match to
get the optimum # of calls that can be supported over the SIP trunk.
If there is a need by the SP to only use G.729 then below is the CLI you would need to
enter the below in config mode:
voice class codec 1
no codec preference 1 g711ulaw
no codec preference 2 g729r8
codec preference 1 g729r8
sip-ua
g729-annexb override
Also, transcoding is required in this case especially when going to voicemail (Cisco
Unity Express) as that only supports G711ulaw. A sample transcoding configuration on
UC500 can be done as shown below:
a. Find the MAC address to be used for transcoder:
UC500#sh int vlan 100 | inc bia
Hardware is EtherSVI, address is 001b.8fa8.4282 (bia 001b.8fa8.4282)
b. Configure the DSPs for transcoding:
voice-card 0
dsp services dspfarm
c. Disable SCCP services (affects only analog ports)
no sccp ccm group 1
Removing this CCM group will result the associated profiles (SCCP appl services) to
unregister with the active CCM or to bring down those appl services.
Do you want to continue...[y/n]? [no]:
no sccp ccm 10.1.1.1 identifier 1
sccp ccm 10.1.1.1 identifier 1 version 4.1
d. Re enable SCCP services and add transcoder MAC address from above. Note
the number of sessions is 6 in this case. This can change based on requirements
for calls and also is based on any other features that use DSPs being turned on or
off:
sccp ccm group 1
associate ccm 1 priority 1
associate profile 2 register mtp001b8fa84282
© 2008 Cisco Systems, Inc. All rights reserved.
MOH Voice T.38
port (G729) Fax
1 8/16 4
1 24/32/48 8
y
Transcoding HW
Conferencing
6 2 sessions (16
conferees)
10 2 sessions (16
conferees)