Configuring SIP Error Message Pass Through

The Configuring SIP Error Message Pass Through feature allows an error response that is received from one SIP leg to pass transparently over to another SIP leg. This functionality will pass SIP error responses that are not yet supported on the Cisco Unified Border Element (Cisco UBE) or will preserve the Q.850 cause code across two sip call-legs.

Feature Information for Configuring SIP Error Message Pass Through

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to https://cfnng.cisco.com/. An account on Cisco.com is not required.

Table 1. Feature Information for Configuring SIP Error Message Pass Through
Feature Name	Releases	Feature Information
Configure SIP Error Message Pass Through	Baseline Functionality	This feature allows a received error response from one SIP leg to pass transparently over to another SIP leg.

Restrictions for Configuring SIP Error Message Pass Through

Configuring SIP error header passing in at the dial-peer level is not supported.

Information About Configuring SIP Error Message Pass Through

SIP error responses that are not supported on the Cisco UBE include: 300—Multiple choices, 301—Moved permanently, and 485—Ambiguous.

Pre-leg SIP error responses that are not transparently passed though include:


Error Code Received	Corresponding Error Reported on the Peer Leg
400—Bad request	500—Internal Server Error
401—Unauthorized	503—Service Unavailable
406—Not acceptable	500—Internal Server Error
407—Authentication required	503—Service Unavailable
413—Request message body too large	500—Internal Server Error
414—Request URI too large	500—Internal Server Error
416—Unsupported URI scheme	500—Internal Server Error
423—Interval too brief	500—Internal Server Error
482—Loop detected	500—Internal Server Error
483—Too many hops	500—Internal Server Error
488— Not acceptable media (applicable only when the call is transcoded)	500—Internal Server Error

How to Configure SIP Error Message Pass Through