How to configure Cisco ISR 4321 as SRST

[mguccione]

Hi to all!.

I have to configure a Cisco ISR 4321 Voice Gateway as SRST for a CUCM in a central Site.

This Router will handle a E1 and will be connected to Central PUB & SUB CUCM with SIP trunk.

Could you guide me to me how to configure this feature and all tips regarding that configuration please?

I configured Cisco Voice gateway between Asterisk PBX, but not yet with CUCM. 

Thanks in advance.

Kind Regards.

[Maren Mahoney]

The 4000 series SRST configuration isn't really all that different than a 2900/3900.

You have to be running SRST 8.6 or higher, but if you have a current IOS you are fine there.

Check here for the Admin/Config guide:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusrst/admin/sccp_sip_srst/configuration/guide/SCCP_and_SIP_SRST_Admin_Guide.html

License Part Numbers can be found here:
https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-survivable-remote-site-telephony/data_sheet_c78-678873.html

[mguccione]

Dear Maren,

              Many thanks por your quick response.

I am confused about this options and I dont know if I have to use or don t:

Should I use this ?  srst mode autoprovision-none 

or should I use this? srst mode autoprovision all

Thanks in advance.

Kind Regards.

[Maren Mahoney]

You want auto-provision all.

As the wording implies, this allows SRST to automatically provision phones that come to it for SRST services. If you use auto-provision none, you would have to manually pre-configure all phones that would require SRST services. That is used in an E-SRST environment, or if you are running CME in SRST mode so that you can pre-configure some or all phones with specific services and features during an SRST event.

HTH

[Maren Mahoney]

I should mention there are additional considerations with regards to what information is saved in your running-config if you do a wr mem during or after an SRST event.

There is a longer discussion of this on:

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/cmesrst.html

Look at both the command-syntax section and the discussion further down the page.