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Cisco Bug: CSCuq03746 - G.729 Codec on 8831 phone has high Rcvr Lost Packets and High Jitter

Last Modified

Nov 27, 2020

Products (35)

  • Cisco SIP IP Phone Software
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 7962G
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 6961
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Known Affected Releases


Description (partial)

8831 Phone drop packet is about 10% while using the Codec G729 which is causing voice quaility issue. If we use G711 instead of G729 the packet drop is about 1% to 4%.

8831, firmware : sip8831.9-3-3-5 and CUCM version : and
Codec : g729
Internal Calls between two ip phones

Related Community Discussions

Need serious help. New 8831 phones having problems.
Thank you in advance for helping with this.   I recently rolled out new 8831 conference phones to replace my old 7937 spider phones, unfortunately the phones are experiencing terrible incoming audio. The phones are at a branch site, connected via MPLS and registered to CUCM 8.6 at HQ. We have a total of 900 7940 phones that have no issues at either location, and bandwidth/congestion is not a problem. The poor incoming audio is happening on every call. Outgoing audio is fine. 8831 phones are having ...
Latest activity: Nov 07, 2014
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