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Cisco Bug: CSCul12526 - 8945 SIP:phone black screen when received reinvite to downgrade BW

Last Modified

Feb 11, 2014

Products (11)

  • Cisco IP Phone 8800 Series
  • Cisco Unified IP Phone 9951
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 8961
  • Cisco Unified IP Phone 8945
  • Cisco Unified IP Phone 8941
  • Cisco Unified IP Phone 9971
  • Cisco Unified IP Phone 6945
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Known Affected Releases

9.4(1)

Description (partial)

Symptom:
8945 SIP:phone black screen when received reinvite to downgrade BW


UCM IP: 10.74.20.165
UCM version: 10.0.1.10000-8
PhoneA load: SIP 9-4-1-2
 
Steps to reproduce:
1. register 1 8945 941 phones and 1 8945934 phone
2. connect pagent between Phone (941 load) and switch
3. drop packet on the pagent port connected to switch
pmod
FastEthernet0/0
active
add ip ip-destination 100.100.12.26 port-destination 16386 ip-src 100.100.12.40(100.100.12.26 is phone with 941 load)
drop on
drop one-in 9
4. make a basic call between phone A and B, CUCM bandwidth set to 2M so video call setup, resolution VGA, capture wireshark trace 
you will find during the bandwidth downgrade, 934 phone black screen once 941 phone send reinvite to negotiate the bandwidth.


Reprodicible:Yes
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