SIP Phones

Third Party SIP Phones

Basic phone support one line and consume three DL
Advanced phone support up to eight lines and video and consume six DL
The 7940 and 7960 can be loaded with a standard SIP software, which is different from using SIP with CUCM.
Features not supported included:
- Phone button templates
- Softkey templates
- IP Phone Services
- Cisco Unified Communication Manager Assistant
- Cisco Unified Video Advantage
- Call Pickup
- Barge
- Presence, etc
Third party SIP phones register with CUCM but are not recognized by a device ID such as MAC.
SIP Digest authentication is used instead.
- By a username and keyed MD5 hash
- CUCM can challenge SIP endpoints and trunks, but can only respond to challenges on SIP trunk
- CUCM can be configured to check the key (i.e. digest credentials) of a username or to ignore the key and only search for the username
- The Line are configured separately on the phone and CUCM and must match

Configure Third Party SIP phones and its DN in CUCM
- Select type basic (1 line) of advanced (Up to 8 lines)
- Use Dummy MAC
Associate SIP phone with the end user

Configure the SIP phone with the IP address of CUCM (proxy address), end-user ID, digest credentials/key hash (optional) and directory number
If digest credential is configured on the user, then we have to enter the password. See SIP Digest Authentication for more detail.