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New Member

ATA 187 does not register with SRST-CME router at branch office


I have a centralized IP Telephony model deployed for a client with CUCM v8.5 serving the Head Office and 3 remote branches. The remote branches are also provisioned with SRST router and running in SRST-CME mode. We recently provided ATA 187 cards to the client.

I need configuration steps for registering ATA 187 in SRST-CME mode.


Ibrahim SAYEED

Everyone's tags (6)
New Member

ATA 187 does not register with SRST-CME router at branch office

Ok..ATA is now registered. I can see the ATA is now registering and taking the correct extension. I just need to test this with the client but that will be on Saturday. Below are the steps I followed:

1. Loaded the image file c2951-universalk9-mz.SPA.152-2.T1.bin so that i could run Telephony version 9 as it enables ATA 187 registration on CME or SRST or SRST-CME router.

2. On CUCM, withtin the SRST reference confguration page, added SRST-CME router ip as the SIP Network/IP Address

   ***  After this the ATA would display the Call Manager2 or Stand By reference. A simple way to check this by clicking on the IP address of ATA in the CUCM window.

3. Created a voice register pool on SRST-CME router

     voice register global

      max-dn 20

      max-pool 20

     voice register pool 1

     id mac F025.7278.4DA3

     number 1 3070

     number 2 3070

     codec g711ulaw

     preference 1

4. Made the following further changes on SRST-CME router

      voice service voip 


       registrar server

** I did this because when i enabled debug ccsip messages, i could see the message that sip registrar is not configured or not enabled.

I then used the commands show voice register pool 1 and sh dial-peer voice summary to check the ATA registration.

I will update further after testing with the client on Saturday.

Hope this helps somebody.


Ibrahim SAYEED

New Member

ATA 187 does not register with SRST-CME router at branch office

which cme version you have on your gateway? Cisco has given support of ATA 187 from CME 9.0. Prior to this version, you can't add/register ATA 187 on gateways.

ATA 187 can be registered to CUCM, Why do you want to register it with gateway?

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