SIP SRST Problems

Unanswered Question
Feb 25th, 2008
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We are having problems implementing SRST with telephones using SIP.

SCCP telephones work fine when CCM goes down and register with SRST. Calls are made normally. But SIP phones (we are using 3911 phones) dont register. Navigating throw the phone menu, in configuration-->network-->ccm5 is the name of our SRST GW. The name but not the IP address.

We are running CCM 6.0.1 and our GW is a 2821 (IOS version 12.4-15T3)

We are working without a DNS server in the network.


SRST config:

voice service voip


registrar server



voice class codec 1

codec preference 1 g711alaw

codec preference 2 g711ulaw




voice class h323 1

h225 timeout tcp establish 3



voice register global

system message Conectado a sistema SRST

max-dn 192

max-pool 58


voice register pool 1

id network mask

number 1 1...

preference 10

proxy preference 1

voice-class codec 1





refer-ood enable




max-conferences 16 gain -6

transfer-system full-consult

user-locale ES

timeouts interdigit 6

ip source-address port 2000 strict-match

max-ephones 48

max-dn 192

system message primary No conexion CallManager Central

system message secondary SRST activado



CAn someone help us please?

Thanks in advance.


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Overall Rating: 5 (1 ratings)
sergio.ambrona Mon, 02/25/2008 - 09:11
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We have found the problem.

In our CCM configuration we have defined the SRST reference with the hostname and IP of the GW. We have changed the name and put in that field the GW ip address and now it works.

It seems that CCM send the hostname instead of the ip address as SRST refernce to SIP Phones, so if you dont have a DNS server in your system the phone can not register with SRST.



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