Cmterm 7941 7961 Sip 8 5 4 Zipl Upd Link

Cisco Unified Communications Manager (CUCM) and SIP Configuration for Cisco IP Phones 7941, 7961, and 7975 with SIP 8, 5, and 4

  1. Check vendor/product documentation for CMTERM family semantics to confirm whether CMTERM refers to a modem, gateway, phone adapter, or other CPE.
  2. Resolve the model span:
    • No video support (unlike 7975)
    • No native SRTP (Secure RTP) – encryption is minimal.
    • No EDNS0 – problematic with large DNS responses.
    • Maximum 3 concurrent SIP dialogs (due to limited DRAM).
    • No IPv6 – version 8.5.4 is IPv4-only.

    Final Verdict

    Issue 3: 7961 showing only 2 line keys