[cisco-voip] One-way audio after BLIND transfer to SIP Trunk

[Sreekanth Narayanan (sreenara)]

What's the IOS version of the CUBE?
After the transfer of the call, when there is on-way audio, if you do a Hold and Resume on the IP Phone, does this solve the problem of one way audio?
When you do a show voip rtp connection on the CUBE, do you see it transmit RTP to the older phone IP even after the transfer?

We've seen deployments of CUBE where it does CUCM --- EO --- CUBE --- DO ---- ITSP and blind transfers result in one-way audio. There are also ringback issues.
Is it a delayed offer from CUCM to CUBE?
If so, I'd suggest you to navigate to SIP Profiles on CUCM and check the following box, and try the call again.
Early Offer support for voice and video calls (insert MTP if needed)

Thanks
Sreekanth

From: Dana Tong [mailto:Dana_Tong at bridgepoint.com.au]
Sent: Wednesday, April 30, 2014 2:01 PM
To: Sreekanth Narayanan (sreenara)
Subject: RE: One-way audio after BLIND transfer to SIP Trunk

Thanks. Will try this now.

It's not invoking an MTP. But even so there are MTP resources on the CUBE.

Will let you know how I get on.

Cheers
Dana


From: Sreekanth Narayanan (sreenara) [mailto:sreenara at cisco.com]
Sent: Wednesday, 30 April 2014 6:26 PM
To: Dana Tong; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net> (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: RE: One-way audio after BLIND transfer to SIP Trunk

Hi Dana,

Have you tried to take packet captures from the back of the phone and see if the stream is reaching the phone from the remote-end?
If there is no MTP/Xcoder invoked, you will see the RTP stream coming directly from the CUBE (assuming that cube is in flow-through mode).

If the SIP traces look fine and IP and ports are exchanged correctly, it's usually something in the network that's not letting the RTP stream pass between the phone and the other end.

Thanks
Sreekanth

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Dana Tong
Sent: Wednesday, April 30, 2014 1:45 PM
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net> (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: [cisco-voip] One-way audio after BLIND transfer to SIP Trunk

Good evening all,

A colleague and myself have discovered an issue where a Blind transfer has one-way audio.

The scenario is as follows:
IP Phone to IP phone call
Transfer to off-net mobile via SIP Trunk (via CUBE)
Blind Transfer

When the remote person answers the phone, there is audio heard on the remote party, but nothing on the IP phone.

The SIP trace SDP appears OK. The IP addresses seem to be c=IN IP is correct.
The web page for the phone reports Stream = Not Ready.

Does anyone have any tips or thoughts on this issue? Have tried a number of config changes with respect to supplementary services on the CUBE, and MTP etc on the CUCM Trunk.

Cheers
Dana

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