Other Phone Types
SIP - Session Initiation Protocol
Cisco IP Phone Documentation for SIP
Cisco CallManager Express
Cisco CallManager Express (CME) was formerly known as Cisco IOS Telephony Services (ITS).
SRST - Survivable Remote Site Telephony
Cisco IP Phone Documentation for SRST
MGCP - Media Gateway Control Protocol
Cisco IP Phone Documentation for MGCP Gateways
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