[cisco-voip] 7841 SIP Phone audio issues on some calls

[Erick Bergquist]

This is fixed, it turned out be the 10.1 7841 firmware.  Upgraded to
latest 10.2 7841 SIP firmware and all those odd calling and audio
issues with the few problem numbers are resolved.

I had went out to the site with another model SIP phone which the
calls worked on so isolated it down to the 7841s pretty quick in
person.
The debugs looked fine, sendrecv and I had TAC also involved who found
no issue in the debugs or CUCM traces or configuration.

Was on load sip78xx.10-1-1SR1-4 , now latest 10.2 load from November 2014.

I think 10.5.1.10000-7 (10.5.1 flat, no SUs) comes with the
10.1.1.SR1-4 load so watch out if you load 10.5.1 without patching.



On Tue, Mar 10, 2015 at 11:54 AM, Daniel Pagan <dpagan at fidelus.com> wrote:
> I would be interested in detailed CCM traces to answer a few questions... of the top of my head:
>
> Is an MTP being introduced into this call? Do you have bi-direction comm with this MTP? I know you said other outbound calls are working but if the destination/dialed party is on the same provider network, the SIP capabilities are typically passed through untouched in my experience.
>
> What is the SDP offer/answer look like from the perspective of the IP phone and CUCM? I would pay attention to the connection info (c=) and attribute (a=) headers, specifically looking to make sure an attrib header contains "sendrecv" or nothing with regards to direction (no directional attribute defaults to sendrecv). I'd be interested also in determining whether the receive packet count is increasing on the IP phone. If not, is the IP address in the connection info header an MTP? If it is, is the MTP at fault here? What does the SCCP statistics or RTP connection information show in terms of tx/rx media?
>
> Is the issue only on 7841 SIP phones? Do you have other phone models running SIP firmware without this issue? If not, can you load SIP firmware and test?
>
> Just thinking off the top of my head here.
>
> Thx
>
> - Dan
>
> -----Original Message-----
> From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick Bergquist
> Sent: Tuesday, March 10, 2015 9:20 AM
> To: voip puck
> Subject: [cisco-voip] 7841 SIP Phone audio issues on some calls
>
> Anyone noticing problems on 7841 SIP phones when calling outbound with a SIP provider?
>
> When we call Microsoft Conference bridge it connects but we can't hear the bridge.
> It works fine from a SCCP phone on same Call Manager and same SIP trunk.
> All other calls work on the 7841 outbound.
>
> CUCM Version 10.5.1.10000-7
>
> Firmware: sip78xx.10-1-1SR1-4
>
> Thanks
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>