7961 phones stuck in SRST fallback with WAN link up??
CCM 4.23 SR2b, 7961 FW version is SCCP41.8-2-2SR1S. H323 gateway 12.4(8c). Some phones mysteriously get stuck in CCM fallback SRST mode and do not re-register with CCM even though WAN is up. Only thing that gets the phones back is to cut the power then they register back to CCM fine??
ip address 192.168.100.15 255.255.255.255
no ip redirects
no ip unreachables
no ip proxy-arp
ip pim sparse-dense-mode
h323-gateway voip interface
h323-gateway voip bind srcaddr 192.168.100.15
max-conferences 8 gain -6
ip source-address 192.168.100.15 port 2000
alias 1 3200 to 7500
multicast moh 239.x.x.118 port 16384 route 192.168.100.1
Before I go into debug/trace mode I wanted to check if anyone has seen this??
Re: 7961 phones stuck in SRST fallback with WAN link up??
Yes, we have started to see this. We have over 2000 IP phones spreadout over a dozen or so branches with a centralized CallManager cluster at the Data Centre. When the Data Centre WAN link goes all phones go in SRST. When the WAN link is restored, quite a few phone remain in "CM fallback" mode. I used a sniffer on one of the IP Phones which was stuck in SRST and I did not see it sending the 120 second keepalive/retry to the the CallManager subscriber (as it should be according to Cisco SRST documentation "Cisco SRST V3.2: Overview of Cisco IOS SRST"); I only see the 30 second keepalives to the SRST router (and the response from the router).
Resetting the Phone fixes it, or you can go to the SRST router and type:
Our SRST config looks just like yours.
We are using CallManager 4.2(1) and skinny client Firmware SCCP41.8-2-1S. All IP Phones are 7941G, with some 7911's and 7961G's.
I'm currently looking through Cisco bug lists but haven't found any known bugs with this skinny client firmware that fits this problem.
I will try upgrading all skinny client software on IP phones before loggin a TAC case.
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