[Freeswitch-users] Gateway SIP OPTIONS ping Contact header

[Michael Jerris]

It may be possible with code to just always add a contact, not sure there is any reason not to, just isn’t typically necessary so it wasn’t there.

> On Sep 12, 2018, at 8:17 AM, Sebastian Zenzerović <sebastian.zenzerovic at inet.hr> wrote:
> 
> 
> 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/ <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: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> <sip:sbc.xxx.xx>;tag=0aB5jm3SF07ve 
>    To: <sip:sbc.xxx.xx> <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> <sip:sbc.xxx.xx>;tag=0aB5jm3SF07ve 
>    TO: <sip:sbc.xxx.xx> <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 

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