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