Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.


sip srst confiig

I don't really touch SIP SRST but i have a unique situation which forces me to use it. 


Do I just add the following


voice service voip
 allow-connections h323 to h323
 allow-connections h323 to sip
 allow-connections sip to h323
 allow-connections sip to sip
 fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
  registrar server
voice register global
 mode srst
 system message SRST mode
 max-dn 30
 max-pool 30
voice register pool  10
 id network mask
 codec g711ulaw

Will SIP SRST work as above 

or do i need to ccm-manager fallback etc  as below and add the SRST max-dn, max-ephone even though Im not using SCCP?


 max-conferences 8 gain -6
 transfer-system full-consult
 ip source-address port 2000
 max-ephones 30
 max-dn 30 dual-line
 system message primary SRST Backup Mode
 time-zone 40
 time-format 24
 date-format dd-mm-yy


Also my PSTN will be H323 FXO ports so I don't need any MGCP fall back so again would i need MGCP part of the configuration or just the SIP Registrar part

Does anyone have a pure sip srst config. they can post






HI1-Kindly check the below:


1-Kindly check the below for your information:-

2-Kindly find the below config.

voice service voip

no ip address trusted authenticate

ip address trusted list

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

no supplementary-service sip moved-temporarily
 no supplementary-service sip refer
 redirect ip2ip


  bind control source-interface GigabitEthernet0/1

  bind media source-interface GigabitEthernet0/1

  registrar server


voice register global

 mode srst
system message SRST ACTIVE

max-dn 10

max-pool 5


voice register pool  1

id network mask   ----->Subnet of sip  phones you want to register to this router


dtmf-relay rtp-nte

codec g711ulaw

3-Yes , if you are not use MGCP , no need . You can only use call fallback active to monitor the next preferred dial-peer.


Finally , make sure  SRST reference with the  IP of the GW


Please rate all useful information