SIP INVITE with SDP (CUCM 7.1(2))

[jevgep]

Hi all,

Regarding Cisco docs:

Cisco Unified Communications Manager follows the procedures that are described in RFC 3261, 3262,

and 3264 to establish and clear down basic SIP calls. Often, on the outgoing side, Cisco Unified

Communications Manager will send out INVITE without SDP. This allows Cisco Unified

Communications Manager to discover the capabilities of both sides and provide media services in

between if necessary (for example, transcoding).

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/sip_msg/line_std/7_0_1/siplst70.pdf

Does it possible to configure CUCM to send INVITE with SDP ?

[Jaime Valencia]

Yes, check the MTP required in the SIP trunk

HTH

java

if this helps, please rate

[jevgep]

Thank you now sip invites come out with sdp.

But how can I change default codec on CUCM from g.711 u-law to g.711 a-law ?

[DmytroSoloviov · Accepted solution]

Hi.

Go to "Trunk Configuration -> SIP Information" frame and change the value of "MTP Preferred Originating Codec" parameter.

WBR,

Dmytro