[SIPForum-discussion] Record-Route and Route headers

[sreekant nair]

Hello,

I have a question with respect to Record-Route and Route headers.

Is it possible for SIP messages to have both a Record-Route Header AND a Route header in the same message?
This is my scenario

U1  -> P1  -> P2 -> U2

Where 
U1 : User Agent 1
U2 : User Agent 2
P1 : Proxy 1
P2 : Proxy 2

Is it valid to construct the messages in the following format( Note: I use symbolic representations)

U1 -> P1              
INVITE: U2 at domain.com
VIA : U1.X.Y.Z
Route: P1.A1.B1.C1;lr
Route: P2.A2.B2.C2;lr

P1 -> P2
INVITE: U2 at domain.com
VIA : P1.A1.B1.C1
VIA : U1.X.Y.Z
Record-Route: P1.A1.B1.C1;
Route: P2.A2.B2.C2;lr

P2 -> U2
INVITE: U2 at domain.com
VIA : P2.A2.B2.C2
VIA : P1.A1.B1.C1
 VIA : U1.X.Y.Z
 Record-Route: P2.A2.B2.C2
Record-Route: P1.A1.B1.C1

Is it valid to have both a Route and Record-Route headers in the P1->P2 leg of the 

Thanks in advance to all in response. 

Regards
Sreekant Nair


      
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