Introduction
This document describes solution for the issue when Session Initiation Protocol (SIP) phones do not register to Survivability Remote Site Telephony (SRST) gateway after provisioned by SRST Manager
Problem
SIP phones do not register with SRST gateway after the site is provisioned using SRST manager. To register the phone, the administrator has to manually go and change the id mac to id ip in SRST gateway configuration under voice register pool. This will particularly happen if the phones are in different subnet
Solution
Step 1. Clear all configuration (telephony service and voice register global) from router
Step 2. Log in to Cisco Unified Communication Manager (CUCM) administration
Step 3. Navigate to System->Security->Phone Security Profile and Check Enable Digest Authentication
Step 4. On CUCM, for each SIP phone, create a user with User ID = Device Name( Complete Media Access Control (MAC) address in format SEPAAAABBBBCCCC) and digest credentials = "Cisco"
Step 5. Associate respective phones to respective users. On Phone setting page, select the respective user for Digest User Field
Step 6. Now provision the site from SRST Manager
Step 7. Go to router and configure
Voice register global
authenticate register
authenticate realm ccmsipline
Step 8. Do not do any other manual configuration
Step 9. Now let the phones failover and they should register with the router
Explanation
As per SRST Manager current design:
- If Phone is not attached to an end user (in CUCM under phone properties Owner field), SRST Manager makes use of MAC address as the username and configures on the router.
- For password SRST Manger by default pushes "Cisco" as the password is not going to be fetched from CUCM.
Workaround
- Ensure that under phone configuration page Owner and Digest user is same.
- For password either manually edit the SRST router config to match the CUCM or specify "Cisco" as digest password for all users created in CUCM.
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