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Cisco Bug: CSCta62976 - 7941 may introduce a 1-2sec delay between rx of ORC and tx of ORCAck

Last Modified

Jan 31, 2017

Products (15)

  • Cisco Unified IP Phone 7900 Series
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 7961G-GE
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7906G
  • Cisco Unified IP Phone 7942G
  • Cisco Unified IP Phone 7975G
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Known Affected Releases

8.3(5)

Description (partial)

Symptom:

It has been observed that a Cisco 7941/61 IP phone may INTERMITTENTLY introduce a 1-2sec delay between the time it receives a SCCP OpenReceiveChannel and the time that it transmits a SCCP OpenReceiveChannelAck during the media establishment phase of a call.

Also happens with 7942/62 and 7945/65, but faster hardware on these later models may have a beneficial effect.

Conditions:

Cisco 7941 IP Phone load version 8.3(5)SR5 being used with a custom Agent Greeting feature implemented via custom scripting and design of multiple components, including IP phones, IOS voice gateways, VXML GW, transcoders/mtps, CVP, IPCC, CTIOS Desktop, in a Cisco Unified Contact Center solution.  Such an implementation may cause several audio/media sessions to be established to the phone in a very short period of time (eg. within 2-3sec) which places an atypically high load on the phone.

Such a configuration has been observed to cause the phone to intermittently introduce a 1-2sec delay between the time the phone receives  a SCCP OpenReceiveChannel and the time that it transmits a SCCP OpenReceiveChannelAck during media establishment phase of a call.
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