In the rapidly evolving landscape of Voice over IP (VoIP), hardware longevity often clashes with software modernization. Cisco’s venerable 7941G and 7961G IP phones, part of the 7900 series, have remained operational in countless enterprise environments for nearly two decades. While End-of-Life (EOL) announcements have pushed many organizations toward migration, a surprising number of legacy deployments continue to rely on these rugged endpoints—especially when converted from Skinny Client Control Protocol (SCCP) to Session Initiation Protocol (SIP).
The .zip extension indicates this is the "non-CallManager" or "alternate" format. It is intended for manual deployment via a TFTP server when a Cisco Unified Communications Manager (CUCM) server is not present. Typical Deployment Steps cmterm 7941 7961 sip 8 5 4 zipl
Do not romanticize this firmware – it is by modern standards. In the rapidly evolving landscape of Voice over
SIP digest realm mismatch. Solution: Set realm parameter in SIPDefault.cnf to match your registrar’s realm (e.g., asterisk ). Also ensure username/password in <authName> and <authPassword> . SIP digest realm mismatch