problem with sending provisional response with Requires header

 

I am getting the following exception from the nist-sip stack when
attempting to send a 183 provisional response for an INVITE which does
not have a Requires header but does have a Supported 100rel header:

 

javax.sip.SipException: No require header in the request

        at
gov.nist.javax.sip.stack.SIPDialog.createReliableProvisionalResponse(SIP
Dialog.java:2350)

 

The INVITE being responded to is:

 

INVITE sip:[email protected]:5091 SIP/2.0

Call-ID: [email protected]!

CSeq: 1 INVITE

From: <sip:[email protected]:5090>;tag=12345

To: <sip:[email protected]:5091>

Via: SIP/2.0/UDP
127.0.0.1:5090;branch=z9hG4bK6af4c36e7910883c0c1a5fd12412a996

Max-Forwards: 70

Contact: <sip:[email protected]:5090>

Supported: 100rel

Allow:
INVITE,OPTIONS,BYE,CANCEL,ACK,PRACK,UPDATE,SUBSCRIBE,NOTIFY,INFO,REGISTE
R,REFER

Content-Length: 0

 

I notice that this problem is an exception thrown in
SIPDialog.createReliableProvisionalResponse based solely on the
condition that the INVITE has no Requires header:

 

            if (request.getHeader(Supported.NAME) == null)

                        throw new SipException("No Suported header in
the request");

 

            if (request.getHeader(RequireHeader.NAME) == null)

                        throw new SipException("No require header in the
request");

 

 However, the comment in this method (which I assume might be a quote
from the RFC) states the following:

 

                        /*

                         * A UAS MUST NOT attempt to send a 100 (Trying)
response reliably. Only

                         * provisional responses numbered 101 to 199 may
be sent reliably. If

                         * the request did not include either a
Supported or Require header

                         * field indicating this feature, the UAS MUST
NOT send the provisional

                         * response reliably.

                         */ 

 

My interpretation of the above is that the request must have either have
a Requires header OR a Supported header. The code, however, appears to
implement a logical AND of these two conditions by insisting that both
headers be provided. Unless my interpretation is wrong, I think this
code is unnecessarily restrictive.   

 

Thanks,

 

Jim Barton

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