CISCO 9971 on SRST Fail on CISCO 2951

[tcharif81]

hi all,

I have a problem with CISCO 9971 phone when i use the SRST mode : the phone cannot be registred on the SRST.  i m using the CISCO IOS 15.1( 1) on 2951.

Please , would you mind to give me a configuration to use Cisco SIP Phone on SRST ( 9971 using SIP by Default).

Thanks in advance

Best regards

Hicham

[Imran Khan R]

The below link will give you the compatibility metrics with IOS, SRST version and the phone loads.

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/data_sheet_c78-520521.html

Now coming to the question of configuring the 9971 phone with SIP load in the SRST mode, below is the configuration

1. At CUCM site, in the SRST configuration page, please make sure we have the SIP Network/IP Address configured.

2. At router site

configuration on router:

=========================

voice service voip

allow-connections sip to sip

sip

  registrar server

voice register global

max-dn 100

max-pool 42

!

voice register dn  1

number 2001

!

voice register pool  1

id network 10.79.163.0 mask 255.255.255.0           // must be the ip network for IP Phone, id mac will not work. When phone registers, it will send sip message to router with its own ip address        

call-manager-fallback

max-conferences 8 gain -6

transfer-system full-consult

ip source-address 10.79.163.6 port 2000

max-ephones 42

max-dn 100

!

=================================================================

SRST#sh sip-ua status registrar

Line          destination      expires(sec)  contact

              call-id

              peer

============================================================

2001          10.79.163.250    3384          10.79.163.250

              001d4595-eae50121-72d6ceda-1a5e0345@10.79.163.

              40001

Hope this helps. Cheers

[masears]

Excellent post.  Solved all my issues.  Was overlooking the CUCM configuration for SIP in SRST reference.

Thanks  --Michael

[sebastien_michelet]

Under the voice register pool, there is a maximum of 5 aliases that can be set, how do we configure this when more than 5 9971 phones are in SRST mode and each need to receive inbound PSTN calls with a separate DID?

I was thinking a register pool for each phone using "id mac" would be the workaround but as you stated, this does not work (9971 phone does not register with id mac).

thanks