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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
Unified Communications Gateways
SCCP-Controlled Analog Ports with Supplementary Features
Voice gateway ISRs support the Cisco Skinny Client Control Protocol (SCCP), which supplies basic and
supplementary features on analog voice ports that are controlled by Cisco Unified Communications
Manager or by a Cisco Unified Communications Manager Express system. Supported features include:
• Audible message waiting indication
• Call forwarding options
• Call park/pickup options
• Call transfer
• Call waiting
• Caller ID
• 3-party conference calls
• Redial
• Speed dial options
For more information on the features supported and their configuration, see SCCP Controlled Analog
(FXS) Ports with Supplementary Features in Cisco IOS Gateways at Cisco.com.
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 the Basic SIP Configuration chapter of 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.
Unified Communications Gateways
The Cisco 3900 series and Cisco 2900 series ISRs support the following Unified Communication
gateways:
• TDM Gateways, page 175
• Cisco Unified Border Element, page 176
• Unified Messaging Gateway, page 176
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