CUCM SIP Invite not offering SRTP / SAVP

mervkwok1 — Wed, 23 Mar 2016 09:25:20 GMT

Hi,

I am trying to setup encrypted SRTP via SIP Trunk.

I have already configured the following:

1) SIP Security Profile to use "Encrypted TLS" and enable "transmit security status"

2) SIP Trunk to enable "Allow SRTP with TLS"

3) SIP Profile to enable "early call offer" and "send SDP in mid-invite"

However, I noticed that the SIP invite offered by the CUCM is still RTP.(m=audio RTP/AVP)

What else do I need to configure to get the CUCM to offer SRTP (m=audio RTP/SAVP) in the SIP invite?

Below is the SIP invite from the CUCM:

INVITE sip:3334@192.168.1.103:5081 SIP/2.0

Via: SIP/2.0/TLS 192.168.1.105:5081;branch=z9hG4bK126c5b3a27d0

From: <sip:1807@192.168.1.105;x-nearend;x-refci=29768466;x-nearendclusterid=StandAloneCluster;x-nearenddevice=SEP001E7AC4D85F;x-nearendaddr=1807;x-farendrefc

i=29768467;x-farendclusterid=StandAloneCluster;x-farenddevice=SEP58BC27756FCC;x-farendaddr=1815>;tag=5621~4e09c267-fb7b-9d1f-0d16-fc861f72f307-29768471

To: <sip:3334@192.168.1.103>

Date: Wed, 23 Mar 2016 07:31:29 GMT

Call-ID: 40b7e400-6f214651-1223-7301a8c0@192.168.1.105

Supported: timer,resource-priority,replaces

Min-SE: 1800

User-Agent: Cisco-CUCM10.0

Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY

CSeq: 101 INVITE

Expires: 300

Allow-Events: presence, kpml

Supported: Geolocation

Call-Info: <urn:x-cisco-remotecc:callinfo>; security= Unknown; gci= 1-13038, <sip:192.168.1.105:5081>;method="NOTIFY;Event=telephone-event;Duration=500"

Cisco-Guid: 1085793280-0000065536-0000000019-1929488576

Session-Expires: 1800

P-Asserted-Identity: <sip:1807@192.168.1.105>

Remote-Party-ID: <sip:1807@192.168.1.105>;party=calling;screen=yes;privacy=off

Contact: <sip:1807@192.168.1.105:5081;transport=tls>;isFocus

Max-Forwards: 70

Content-Type: application/sdp

Content-Length: 275

v=0

o=CiscoSystemsCCM-SIP 5621 1 IN IP4 192.168.1.105

s=SIP Call

c=IN IP4 192.168.1.105

b=TIAS:64000

b=AS:64

t=0 0

m=audio 24614 RTP/AVP 0 8 18 101

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:18 G729/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

Thanks.

Sincerely,

Merv

Re: CUCM SIP Invite not offering SRTP / SAVP

lior look — Fri, 17 Jun 2016 13:47:23 GMT

Hello mervkwok1,

Please move the post to the support community.

In this case you need assistantance with CUCM operation and configuration.

try this area:

https://supportforums.cisco.com/community/5961/ip-telephony

topic CUCM SIP Invite not offering SRTP / SAVP in Call Control

CUCM SIP Invite not offering SRTP / SAVP

Re: CUCM SIP Invite not offering SRTP / SAVP