[SIPForum-discussion] Record-Route Header Allowable in 4xx-6xx Responses?

[nickdiciaccio at comcast.net]

Hello, 

I went through RFC 3261 and I saw where a UAS must include a record-route header in a response back to a UAC which establishes a session (see section 12.1.1). However, I didn't see in the RFC where a UAS is specifically prohibited from sending a record-route header back in a response which doesn't establish a session, i.e. a 4xx-6xx response. Can someone confirm for me whether it's permissible for SIP responses in the 4xx-6xx range to include the record-route header? 

Nick 
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