[Freeswitch-users] Gateway SIP OPTIONS ping Contact header

[Sebastian Zenzerović]

Hello,

is it possible to add (configuration option/variable?) Contact header to 
outgoing gateway ping messages sent by Freeswitch?

Remote SIP peer is answering "403 forbidden" as there is no Contact 
header present in SIP OPTIONS.
Not a big deal since FS sees the peer as available/UP anyway but could 
be a interoperability enhancement between FS and Microsoft Direct 
routing service (https://aka.ms/dr/).

Here are the requirements:
• Must: When placing calls to the Direct Routing interface, the 
'CONTACT' header must have the SBC FQDN in the URI hostname
• Syntax: Contact: <phone number>@<FQDN of the SBC>:<SBC 
Port>;<transport type>
• If the parameter is not configured correctly, OPTIONS are rejected 
with a '403 Forbidden' message

Freeswitch log:

    OPTIONS sip:sip-du-a-euno.pstnhub.microsoft.com;transport=tls SIP/2.0
    Via: SIP/2.0/TLS x.x.x.x;branch=z9hG4bKvjX0rU7K5QtKS
    Max-Forwards: 70
    From: <sip:sbc.xxx.xx>;tag=0aB5jm3SF07ve
    To: <sip:sbc.xxx.xx>
    Call-ID: 101b723c-3113-1237-6092-00155d000d46
    CSeq: 128016309 OPTIONS
    User-Agent: FreeSWITCH-mod_sofia/1.8.1-2-4f54cff36a~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

    SIP/2.0 403 Forbidden
    FROM: <sip:sbc.xxx.xx>;tag=0aB5jm3SF07ve
    TO: <sip:sbc.xxx.xx>
    CSEQ: 128016309 OPTIONS
    CALL-ID: 101b723c-3113-1237-6092-00155d000d46
    VIA: SIP/2.0/TLS x.x.x.x;branch=z9hG4bKvjX0rU7K5QtKS
    REASON: 
Q.850;cause=21;text="4da4bb47-5ace-41b2-ba4b-6516fb4771c2;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.2018.9.10.4 i.EUNO.4


Thanks.
BR,
Sebastian




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