SIP Features

 

Basic Support

Supported Methods

SIP Extensions

Routing/Call Handling

Media

Interworking

 

Basic Support

A SIP Profile allows you to easily assign a number of SIP features to a Physical IMG. You create a SIP Profile and then assign profiles to a gateway in the External Gateway pane.

 

Supported Methods

 

SIP Extensions

 

Routing/Call Handling

This feature allows the IMG to respond to the 3XX class of SIP messages returned from a redirect server.

The IMG can route SIP traffic to a remote entity based on the IP Address or the Host Name. The IMG supports having multiple DNS servers for redundancy and reliability purposes. See DNS Server and DNS Client panes.

This feature allows you to limit the number of INVITE re-transmission attempts (1-5 attempts). The number configured supersedes the standard # of re-transmissions specified in RFC3261 (which is based on timers T1 and T2. The default is Re-transmit All. You enable this feature in the SIP Profile.

The IMG can monitor the status of external SIP gateways by sending periodic SIP OPTIONS messages. If the gateway does not respond in a configured amount of time the IMG will mark the gateway as down and attempt to re-route the call to a different gateway. See SIP Busy Out.

 

Media

 

Note: If the remote side includes the fax maximum rate parameter in the SDP body of the INVITE message, the gateway returns the same rate in the response SDP.

 

 

Interworking