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Cisco Bug: CSCun62243 - SPA 50X/5X5: Phone responds with an Invalid Codec

Last Modified

Mar 19, 2014

Products (11)

  • Cisco Small Business SPA500 Series IP Phones
  • Cisco SPA301 1 Line IP Phone
  • Cisco SPA512G 1-Line GigE IP Phone
  • Cisco SPA504G 4-Line IP Phone
  • Cisco SPA514G 4-Line GigE IP Phone
  • Cisco SPA501G 8-Line IP Phone
  • Cisco SPA303 3 Line IP Phone
  • Cisco SPA502G 1-Line IP Phone
  • Cisco SPA508G 8-Line IP Phone
  • Cisco SPA525G 5-line IP Phone with Color Display
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Known Affected Releases

7.5.5

Description (partial)

Symptom:
The first file reinvite-codec-issues-1.cap shows the following

       Packet 814 INVITE
Media Description, name and address (m): audio 11780 RTP/AVP 9 127
                Media Attribute (a): rtpmap:9 G722/8000
                Media Attribute (a): rtpmap:127 telephone-event/8000
NOTE: using the 127 for the RTP-Type. While it is far more common to use 101, 127 is legal.

       Packet 863 OK
                Media Description, name and address (m): audio 16474 RTP/AVP 8 127
                Media Attribute (a): rtpmap:8 PCMA/8000
                Media Attribute (a): rtpmap:127 telephone-event/8000

The phone has responded with an invalid codec, 8 PCMA/8000 was not offered in the INVITE!

Conditions:
You will need both phones registered, on our service, using the previous files I sent for Ext 501 and 502.

Please adjust the settings on both your phones:

•	Outbound proxy: 75.145.154.228:3060
•	The preferred codec should be: 722

1.	Dial extension 1000
2.	While the greeting is playing dial the extension of the other phone 502 (or 501)
3.	Answer the other phone, you should have a problem with the audio.

Capture will show the re-invite is using the wrong codec and sending the wrong RTP.
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