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aod
New Member

1/2 of phones registered to SRST gateway

I had an incident this afternoon where 1/2 of our phones were stuck in "CM List" when trying to chnage to failback mode. We lost a circuit. 1/2 of the phones went into SRST while the other 1/2 tried but were stuck in CM list. Any idea what could have caused the 1/2 not to re-registed to SRST gateway?

6 REPLIES

Re: 1/2 of phones registered to SRST gateway

Have you tested SRST on this router before where all phones have registered to the router ? how many phones are in question and how does your SRST config look like (call-manager-fallback - sub commands)

Also what router platform is in question ?

aod
New Member

Re: 1/2 of phones registered to SRST gateway

It has been successfully tested before. I don't know the level of severity. Command is manager-fallback. We are using a 3845.

Re: 1/2 of phones registered to SRST gateway

I was specifically interested in the sub-commands under call-manager-fallback mode. Have you limited the total number of phones to less than the total number of phones you have ? (max-ephones 3845 should support upto 720 phones.

aod
New Member

Re: 1/2 of phones registered to SRST gateway

Specifically, we have 250. I know that we could support more. What happens if we have more than 250 trying to register to the gateway?

Re: 1/2 of phones registered to SRST gateway

3845s support upto 720 phones. The number of phones that can register is limited by the max-ephones command. What do you have set that to ? Also are you using a Class B or Class C subnet for that many phones ? A class holds only 254 addresses and you may have to create additional voice vlans, or subnets to supports phones more than 250. I am not sure if there was enough ip address left in your dhcp pool, that could have also caused the problem.

aod
New Member

Re: 1/2 of phones registered to SRST gateway

We have enough ip address. I suspect it's a ephone configuration (not enough phones configured) and a bug issue (CSCsa97383).

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