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Cisco Bug: CSCsz00966 - IPv6: IPv6 only phone keeps sending RTP from expired address

Last Modified

May 03, 2011

Products (1)

  • Cisco Unified IP Phone 7900 Series

Known Affected Releases


Description (partial)

IPv6 only phone keeps sending RTP from expired address

         phone load :      8-5-2TH1-5S
         Protocol:           SCCP  
        Call Manager:

Reproduce steps:
1.) Enable stateless configuration on router and set a short valid life time using command "ipv6 nd prefix ...".
2.) Setup 2 phones, phone A in IPv6 only mode, phone B in Dual mode. Establish a call between the 2 phones.
3.) During the call, update the prefix on router. For example, change the previous configuration "ipv6 address 2001:db8:1:74::1/64" to "2001:db8:1:774::1/64".
4.) Do not end the call but wait until the valid life time expired. Check from the console or Network Configuration on phone UI, you can find the IPv6 address has been updated.
But at this step, main screen of each phone shows it is in connected state. Checking from Wireshark log, you can find phone A is still sending packets from old address but phone B is not.
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