Asterisk, Cisco CP-9971, sdp-anat

Asterisk Asterisk Endpoints
1

Hi, all.
Is anybody managed call from Cisco CP-9971 to Asterisk (12.8.0)?
We have that ip phone and call ends with error in log ‘Received SIP INVITE with unsupported required extension: required: unsupported:sdp-anat’.
How to enable sdp-anat in Asterisk?
And there should be some option in xml configuration file for CP-9971 to disable sdp-anat. May be somebody know, what exactly is option?

2

Asterisk does not support the “sdp-anat” extension so there is no place to enable it. You would indeed have to figure out how to disable it in the XML file for the Cisco. I don’t have experience with that phone so unfortunately I can’t help in that regard but it is the direction you need to go in.

3

Thanks for the answer

4

Hi there.

I now encountered this issue and I found the solution. Maybe this will still be helpful for someone. I tested it with 7821, but should work for other devices).

Basically they request sdp-anat only in dual-stack mode, so set ipAddressMode in the XML to 0 (IPv4) or 1 (IPv6) instead of 2 (dual-stack) based on your environment.

5

Thanks! I will definitely add this to my file - I have many Cisco phones in service and have never heard of this - although I have never tried to dual-stack them.

6

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