About SIP headers

Message headers, which comply with the SIP standard, are automatically added when you add Send requests and responses. Message headers that are generated at runtime are displayed as <<Auto>>, and the actual values are visible in the log file.

The following table lists the headers that are automatically generated with a Send request. If a subsequent Send request uses the same context as a previous Send request, the message headers are automatically copied to the new request. The exceptions are Content-Type, which is copied only if the current request contains body contents, and Content-Length and Call-ID, whose values are generated during runtime and appear in the log file.

Header	Generated with	Default value
Call-ID	All methods	<<Auto>>. Cannot be modified.
Contact	Subscribe, Invite, Update, Notify, Refer	<<local-host>>:local-port. The default local port is 5555.
Content-Length	All methods	<<Auto>>.
CSeq	All methods	Numbered sequentially for each context. For example, the first Invite CSeq that uses context x is 1 INVITE, the next Invite CSeq that uses context x is 2 INVITE, but the next CSeq, which uses context y (a new context), is 1 INVITE.
Event	Publish, Subscribe, Notify	none
From	All methods	none
Max-Forwards	All methods	70
RAck	Prack	none
Refer-To	Refer	""<SIP:refer-to-url>
Subscription-State	Notify	none
To	All methods	none
Via	All methods	<<local-host>>:local-port

The following table lists the headers that are automatically generated with a Send response. The actual values are generated during runtime and are visible in the log file.

Header	Default value
Call-ID	<<Auto>>. Cannot be modified.
Contact	Generated for Invite, Subscribe, Refer, and Update methods when the response is 200 OK:<<local-host>>:local-port
Content-Length	<<Auto>>
CSeq	<<Auto>>
From	<<Auto>>
To	<<Auto>>
Via	<<Auto>>

• Add a header
  To add a SIP header, select it in the Message Headers table, and click Add.

• Editing a header
  To edit a SIP header, select it in the Message Headers table, and click Edit.

• Delete a header
  To delete a SIP header, select it in the Message Headers table, and click Remove.

Related

SIP test editor overview

Add SIP contexts

Add sequence patterns to SIP tests

Related tasks

Configure background registration

Configure a test to use the TLS transport

Create a SIP counterpart test

Run tests on computers with multiple network addresses

Configure different ports for a SIP location

Verify expected behavior