Presentation is loading. Please wait.

Presentation is loading. Please wait.

Comparison of SIP Proxy and Redirect Servers Presented By: Greg Osterhout Sr. Mgr, SIP Services Development and Evolution.

Similar presentations


Presentation on theme: "Comparison of SIP Proxy and Redirect Servers Presented By: Greg Osterhout Sr. Mgr, SIP Services Development and Evolution."— Presentation transcript:

1 Comparison of SIP Proxy and Redirect Servers Presented By: Greg Osterhout Sr. Mgr, SIP Services Development and Evolution

2 SIP Reference Architecture Terminal Endpoints SIP User Agent for user devices User Proxy User Proxy Network/User Proxy Registration of SIP endpoints Provides endpoint mobility User specific services Domain resolution SIP PSTN PSTN Gateway SIP User Agent for PSTN Trks SIP services for PSTN terminations SS7/PRI SIP I2004 EtherSets SIP Soft Client USB Phone SIP Network Nodes Mobil Oil Network User Proxy SIP

3 SIP User Proxy Primarily exist in customer IP networks Provides endpoint mobility services via SIP registration methods Provides wide range of user specific services — simple canned service — full user controlled services via CGI or CPL scripts or servlets Network User Proxy Provides Domain mapping for network endpoints Could provide SIP services to customers that can’t feasibly manage their own user proxy Proxy Capability Driven By Network

4 pulver.com Proxy server nortel.com 1. INVITE SIP/2.0 From: Location Server jeff.pulver 2. INVITE SIP/2.0 From: 3. SIP/ ok From: 4. SIP/ OK From: 5. ACK SIP/2.0 From: 6. ACK SIP/2.0 From:

5 SIP Proxy Servers “Network Servers” that Proxy requests to other server User Proxies manage sets of SIP users Provides dynamic association of SIP endpoints Proxy capabilities: — outgoing calls — address lookup — policy management — firewalls — call path hiding Proxy servers can be stateful or stateless Proxies Provide SIP User Management

6 Stateful Proxy Servers Maintains call context Replicates User Agent Server/User Agent Client to process requests/responses Call state and transaction state can be maintained Forking proxies require state TCP proxies must be stateful for reliability Enhanced services require state for execution Can populate billing information Services Dictate Statefulness of Proxy

7 Stateless Proxy Servers No call context Response is not based on User Agent replication Provides client anonymity Restricted gateway access High processing capacity Allows for easier replication than stateful proxy Can have semi-stateful proxy for ultimate benefits Stateless Proxies Geared for Capacity

8 1. INVITE From: 2. SIP/ Moved temporarily Contact: nortel.com pulver.com Redirect Server Location Server Jeff.pulver 4. INVITE From: 3. ACK From: 5. SIP/ OK To: 6. ACK From:

9 SIP Redirect Servers Accept SIP requests, map the address into new addresses, and return these addresses to the client Do not initiate requests Do not accept calls Lower state overhead required than proxy servers High processing capacity due to fewer messages to process Services are client device dependent Service Dependence on Client

10 Can be stateful or stateless Flexible, network service implemenations Reliability achieved through replication Scalability achieved through partitioning Overload potential if not properly scaled Hybrid (semi-stateful) model provides maximum benefits High capacity Minimal state overhead Service execution pushed to client Hybrid Proxy Is Best Alternative


Download ppt "Comparison of SIP Proxy and Redirect Servers Presented By: Greg Osterhout Sr. Mgr, SIP Services Development and Evolution."

Similar presentations


Ads by Google