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Monday TECHtionary.com TECH-Tip – SIP-Session Initiation Protocol Proxy Server with Special Example – Cisco CCM-CallManager Route Patterns
[June 20, 2005]

Monday TECHtionary.com TECH-Tip – SIP-Session Initiation Protocol Proxy Server with Special Example – Cisco CCM-CallManager Route Patterns


Monday TECHtionary.com TECH-Tip – SIP-Session Initiation Protocol Proxy Server
The animated TECH-Tip tutorial is available at http://www.techtionary.com
Summary
SIP-Session Initiation Protocol is the real-time communication protocol for VOIP-Voice over IP. SIP has been expanded to support video and instant-messaging applications.
Details
SIP is designed to perform basic call-control tasks, such as session call set up and tear down and signaling for features such as call hold, caller ID, conferencing and call transferring. However with SIP, the intelligence for call setup and features resides on the SIP device or user agent, such as an IP phone or a PC with voice or instant-messaging software. In contrast, traditional telephony or H.323-based telephony uses a model of intelligent, centralized phone switches with dumb phones with SS7-Signaling System 7 in PSTN-Public Switched Telephone Network telephone switching and H.323 or Media Gateway Control Protocol in IP telephony providing call control/routing. For more go to www.sipforum.org


SIP-Session Initiation Protocol Proxy Server Forks (select different paths) Invite(s) to multiple User Agents (telephones). Forks can be sequential or concurrent. Session established to first UA-User Agent to respond with OK. Cancel sent to non-respondent (no answer) User Agents. Forks are useful in a call center environment or call hunting. Proxy Server call flow is where Proxy Server sets up call. Proxy Server is an optional SIP-Session Initiation Protocol component that handles routing of SIP signaling but does not initiate SIP messages. SIP call flow with Redirect Server. Redirect Server an optional SIP component that does not route SIP messages. Redirect Server returns a redirect (change in routing) to UA-User Agent for direct routing (SIP is designed for end-to-end signaling without intervention by a server). Shown is an example of SIP-Session Initiation Protocol used for instant messaging. The function of a Presence Server is to manage access, connections, directory (who's who), billing and tracking and other management functions. Here is an example of SIP-Session Initiation Protocol used for enhanced, multi-user, multi-media conferencing. Note internet access or VXML-Voice eXtensible Markup Language applications can be directed based on an Exception-triggered instant conference such as a disaster.
Special Example – Cisco CCM-CallManager Route Patterns
CCM-Cisco CallManager route (dialing) planning consists of:
- Route Pattern (numbers) - matches dialed number or translates (manipulates) to Route Lists
- Route Lists (call roadmaps/directions) which can point to the same Route Group
- Route Groups - interconnection devices - CCM-Cisco CallManager and Gateways to the PSTN-Public Switched Telephone Number
Gateways - individual Gateways can only be in one Route Group
Simply, telephone calls or Route Patterns are placed in Route Lists where they are verified and placed via Route Groups.
User dials telephone number
Route Pattern is sent to Route List.
Route List which compares with Route Groups.
Call Pattern is routed (connected) via Route Group device.
If Multiple Route Groups, CCM routes call via First Route Group.
If First Route Group unavailable, then route via Second Route Group or return busy signal.
Shown in the animation are examples of Route Patterns for internal call, call via Gateway and via IP-WAN.

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