[Freeswitch-users] Teens Direct Routing - contact and record-route headers are missing

[Tulipa Frigo]

Hi all,

I'm trying to configure my freeswitch to send and receive calls from Teens
Direct Routing . Then, I configured the SIP gateway
/usr/local/freeswitch/sip_profiles/extern/gateway_teens.xml :

<include>
  <gateway name="teens">
  <param name="realm" value="sip.pstnhub.microsoft.com:5061"/>
  <param name="register" value="false"/>
  <param name="register-transport" value="tls"/>
  <param name="ping" value="25"/>
  </gateway>
</include>

The Teens Direct Routing only enable the sip trunk after receive and send
SIP OPTIONS with success, in both direction. The OPTIONS FLOW description
from Direct Routing Configure page,
https://docs.microsoft.com/en-us/microsoftteams/direct-routing-configure:
"The SBC sends a OPTIONS messages to Teens Direct Routing and receives a
200OK. When Direct Routing sees incoming OPTIONS, it will start sending
outgoing SIP Options messages to the SBC FQDN configured in the Contact
header field in the incoming OPTIONS message and the SBC reply with 200OK."

The problem is that the freeswitch (SBC) is receiving the response
FORBIDDEN , with reason :
Q.850;cause=21;text="29175f0d-ebe8-43ea-836f-708b6d4b0d4f;Record-Route and
Contact headers are missing" .

Folowing is the OPTIONS msg sent from freeswitch to Teens Direct Rounting
and the response:

   ------------------------------------------------------------------------
send 597 bytes to tls/[52.114.76.76]:5061 at 11:10:15.890560:
   ------------------------------------------------------------------------
   OPTIONS sip:sip.pstnhub.microsoft.com:5061;transport=tls SIP/2.0
   Via: SIP/2.0/TLS 177.53.17.168:5081;rport;branch=z9hG4bKg5DyZ09c7Bv2r
   Max-Forwards: 70
   From: <sip:sip.pstnhub.microsoft.com:5061>;tag=ge55jU7NBK1rr
   To: <sip:sip.pstnhub.microsoft.com:5061>
   Call-ID: 3f0f42b7-3a09-1238-5e8a-00155d11a606
   CSeq: 8385268 OPTIONS
   User-Agent:
FreeSWITCH-mod_sofia/1.8.6+git~20190606T190249Z~93b4c92e75~64bit
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE,
REGISTER, REFER, NOTIFY
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, refer
   Content-Length: 0

   ------------------------------------------------------------------------
recv 545 bytes from tls/[52.114.76.76]:5061 at 11:10:16.070876:
   ------------------------------------------------------------------------
   SIP/2.0 403 Forbidden
   FROM: <sip:sip.pstnhub.microsoft.com:5061>;tag=ge55jU7NBK1rr
   TO: <sip:sip.pstnhub.microsoft.com:5061>
   CSEQ: 8385268 OPTIONS
   CALL-ID: 3f0f42b7-3a09-1238-5e8a-00155d11a606
   VIA: SIP/2.0/TLS 177.53.17.168:5081;branch=z9hG4bKg5DyZ09c7Bv2r;rport
   REASON:
Q.850;cause=21;text="29175f0d-ebe8-43ea-836f-708b6d4b0d4f;Record-Route and
Contact headers are missing"
   CONTENT-LENGTH: 0
   ALLOW: INVITE
   ALLOW: ACK
   ALLOW: OPTIONS
   ALLOW: CANCEL
   ALLOW: BYE
   ALLOW: NOTIFY
   SERVER: Microsoft.PSTNHub.SIPProxy v.2019.7.4.9 i.EUNO.2

   ------------------------------------------------------------------------

How can I add these headers into OPTIONS msg ?

Thanks and Regards

Tulipa Frigo
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