SIP - Session Initiation Protocol
Cisco SIP IP 7960/7940 Phone User Guide
Cisco IP Phone Administrator Guides for SIP
Cisco IP Phone 7960/40 Release Notes for SIP
Cisco 7940 and 7960 IP Phones Firmware Upgrade Matrix
Firmware upgrade information for MGCP, SCCP, and SIP IP phones on the Cisco 7940 and Cisco 7960
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