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Comparison of SIP Proxy and Redirect Servers. Presented By: Greg Osterhout Sr. Mgr, SIP Services Development and Evolution. PSTN. SIP Reference Architecture. I2004 EtherSets. User Proxy. SIP Soft Client. Terminal Endpoints SIP User Agent for user devices. SIP. User Proxy. SIP.

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comparison of sip proxy and redirect servers

Comparison of SIP Proxy and Redirect Servers

Presented By: Greg Osterhout

Sr. Mgr, SIP Services Development and Evolution

sip reference architecture

PSTN

SIP Reference Architecture

I2004

EtherSets

User

Proxy

SIP Soft Client

  • Terminal Endpoints
  • SIP User Agent for
  • user devices

SIP

User

Proxy

SIP

USB Phone

  • Network/User Proxy
  • Registration of SIP endpoints
  • Provides endpoint mobility
  • User specific services
  • Domain resolution

SIP Network Nodes

SIP

SIP

SIP

Mobil Oil

Network

User

Proxy

  • PSTN Gateway
  • SIP User Agent for PSTN Trks
  • SIP services for PSTN terminations

SS7/PRI

sip user proxy
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

slide4

Sip Proxy Mode

pulver.com

nortel.com

jeff.pulver

pulver@von1

user@nortel.com

pulver@von1

Proxy server

1. INVITE sip:jeff.pulver@pulver.com SIP/2.0

From: sip:user@nortel.com

2. INVITE sip:pulver@von1 SIP/2.0

From: sip:user@nortel.com

3. SIP/2.0 200 ok

From: sip:pulver@von1

Location Server

4. SIP/2.0 100 OK

From: sip:jeff.pulver@pulver.com

5. ACK sip:jeff.pulver@pulver.com SIP/2.0

From: sip:user@nortel.com

6. ACK sip:pulver@von1 SIP/2.0

From: sip:user@nortel.com

sip proxy servers
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

stateful proxy servers
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

stateless proxy servers
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

slide8

Sip Redirect Mode

pulver.com

nortel.com

pulver@von1

Jeff.pulver

user@nortel.com

Pulver@von1

RedirectServer

Location Server

1. INVITE sip:jeff.pulver@pulver.com

From: sip:user@nortel.com

4. INVITE sip:pulver@von1.pulver.com

From: user@nortel.com

5. SIP/2.0 200 OK

To: user@nortel.com

2. SIP/2.0 320 Moved temporarily

Contact: sip:pulver@von1.pulver.com

6. ACK sip:pulver@von1.pulver.com

From: sip:user@nortel.com

3. ACK sip:jeff.pulver@pulverr.com

From: sip:user@nortel.com

sip redirect servers
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

slide10
Can be stateful or stateless

Redirect Server

Proxy Server

  • High capacity
  • Flexible, network service implemenations
  • Minimal state overhead
  • Service execution pushed to client
  • Reliability achieved through replication
  • Scalability achieved through partitioning
  • Overload potential if not properly scaled
  • Hybrid (semi-stateful) model provides maximum benefits

Hybrid Proxy Is Best Alternative