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Cisco Bug: CSCvt19392 - 78xx/88xx phones not playing local ring back when 180 w/o SDP & non g.711u early media is received

Last Modified

Jul 13, 2020

Products (13)

  • Cisco IP Phone 7800 Series
  • Cisco IP Conference Phone 7832
  • Cisco IP Phone 8865
  • Cisco IP Phone 7841
  • Cisco IP Phone 8851
  • Cisco IP Phone 7821
  • Cisco IP Phone 8811
  • Cisco IP Phone 8845
  • Cisco IP Phone 7861
  • Cisco IP Phone 8861
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Known Affected Releases


Description (partial)

The phone is not playing the local ring back when there is a 180 without SDP and non g.711u early media is received.

Basically the problem happens in this scenarios: 

1. IP Phone sends Invite with SDP.
2. CUCM forwards SDP to remote side. 
3. It gets 180 Ringing with SDP. 
4. CUCM sends 180 Ringing w/o SDP due to sip profile configuration. 
5. IP phone gets 180 ringing without SDP and flag to play local ringback.
6. Remote side sends media to ip phone. It's not G711u. No SDP was received. In this case IP phone doesn't play remote stream. At the same time itt doesn't play local ring back tone.

This defect apply to all the 78xx and 88xx phones

- Remote side sends a stream
- SDP is not provided to ip phone 
- Stream is not g711u
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Bug Details Include

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