Preview Tool

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
View all products in Bug Search Tool Login Required

Known Affected Releases


Description (partial)

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!

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:
•	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.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.