CUCM 10.5 problem with call transfe

[lorenzo.durso]

Good morning

I have a problem with call transfer with consultation from an intern to another.

SIP phones used 7841

This schenario

Branch A

CUCM 10.5 at DATACENTER

RTR with gre-over ipsec TUNNELS to the DC

Pstn Gateway with 3 ISDN-BRI

Branch B

RTR-gre-tunneled over ipsec to DC

trace attachement

Problem

Receiving a call from the PSTN in Branch A, I try to transfer it to my colleague in the same office and after having talked with him, when i try to transfered the call, both ipphone remain blocked.

By tracer known that the error received is

MSG_LABEL: 488 Not Acceptable Media

This doesn't happen if from Branch A transfer to  Branch B

Can someone explain me why the phone of the Branch A not accept the media streams?

Thanks a lot

[Carlo Poggiarelli]

Hi Lorenzo.

Just to make sure, if you make a direct call transfer, does it work?

Can please send a full trace from when pstn  call arrives to Phone A?

Please let me know

Regards

Carlo

[lorenzo.durso]

Hi Carlo,

with the direct transfer there are no problems even if I use a SCCP phone I don't find some problem.

Attachment trace complete

Best Regards

Lorenzo

[Carlo Poggiarelli]

Hi Lorenzo.

Thanks for sending me the info requested.

Which signaling protocol are you using between CUCM and VG?

If SIP, please activate a debug ccsip message during the call transfer and post it here.

Thanks

Regards

Carlo

[lorenzo.durso]

Hi Carlo

the VG uses H323 protocol to communication with the CUCM

Regards

Lorenzo

[Carlo Poggiarelli]

Hi Lorenzo.

On your VG, add a voice class codec with g711U/Alaw and g722-64 codec and add it to dialpeer pointing to CUCM.

Please try it and let me know.

HTH

Regards

Carlo

[lorenzo.durso]

Hi Carlo on the dial peer to the CUCM is already present the codec. I opened a tac and an engineer cisco asked me the sniffed traffic behind the phone. I will update the post as soon as I will get a response. Let me know if you have another idea to solve this problemi. Thank you Lorenzo

[Carlo Poggiarelli]

Hi Lorenzo.

Can you please post full vg config in order to replicate it on my lab?

Thanks

Regards

Carlo

[lorenzo.durso]

Hi Carlo,

I open a case with Cisco have not been able to re solve the problem, requiring every time packet capture behind the phones.
when I discovered that the problem came from the SIP inspection that was the firewall in the data center I decided to update the firewall multicontext with the latest version, this has solved the problem. I do not have enough data to declare that the version of ASA is affected by bugs, but it is very likely

thanks for your time

Lorenzo