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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Unified Communications on Cisco Integrated Services Routers
Call Control Protocols
Session Initiation Protocol (SIP)
Session Initiation Protocol (SIP) is a peer-to-peer, multimedia signaling protocol developed in the IETF
(IETF RFC 3261). Session Initiation Protocol is ASCII-based. It resembles HTTP, and it reuses existing
IP protocols (such as DNS and SDP) to provide media setup and tear down. See Cisco IOS SIP
Configuration Guide for more information.
For router configuration information under SIP, see Basic SIP Configuration chapter of the Cisco IOS
SIP Configuration Guide.
Voice gateways provide voice security through SIP enhancements within the Cisco IOS Firewall. SIP
inspect functionality (SIP packet inspection and detection of pin-hole openings) is provided, as well as
protocol conformance and application security. The user is given more granular control on the policies
and security checks applied to SIP traffic, and capability to filter out unwanted messages. For more
information, see “Cisco IOS Firewall: SIP Enhancements: ALG and AIC” at Cisco.com.
Media Gateway Control Protocol (MGCP)
Media Gateway Control Protocol (MGCP) RFC 2705 defines a centralized architecture for creating
multimedia applications, including Voice over IP (VoIP). See Cisco IOS MGCP and Related Protocols
Configuration Guide for more information.
ISRs are configured primarily as residential gateways (RGWs) under MGCP. For residential gateway
configuration information, see the Configuring an RGW section of the Basic MGCP Configuration
chapter of Cisco IOS MGCP and Related Protocols Configuration Guide.
H.323
H.323 is an umbrella recommendation from the International Telecommunication Union (ITU) that
defines the protocols to provide voice and video communication sessions on a packet network. The
H.323 standard addresses call signaling and control, multimedia transport and control, and bandwidth
control for point-to-point and multi-point sessions. See Cisco IOS H.323 Configuration Guide for more
information about H.323.
For router configuration information, see the Configuring H.323 Gateways chapter of Cisco IOS H.323
Configuration Guide.
Line-side Protocols
The Cisco 3900 series and Cisco 2900 series ISRs support the following line-side call control protocols:
• SCCP-Controlled Analog Ports with Supplementary Features, page 174
• Session Initiation Protocol (SIP), page 174
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