[OpenSIPS-Users] OpenSIPS as Teams SBC

[Ovidiu Sas]

Microsoft’s SIP routing is RFC compliment.
There’s no special routing for approved SBCs. The routing Is based on the
type of SBC: B2BUA vs proxy, which again, is rfc complient.
For OpenSiPS, which is a proxy, all the configuration steps are very well
outlined in the blog. No need to mess with Via or Contact headers! Follow
the loose routing rules as outlined in the rfc and all is good.

Regards,
Ovidiu Sas

On Mon, May 11, 2020 at 05:51 Slava Bendersky via Users <
users at lists.opensips.org> wrote:

> Hello All,
> Microsoft is rely on approved sbc vendors, where  most sbc are use VIA and
> headers to route traffic. That why Contact header is important, also they
> use from and to.
> Opensips is rely on route headers and use different way to route it.
>
> volga629
>
> ------------------------------
> *From: *"John Quick" <john.quick at smartvox.co.uk>
> *To: *"OpenSIPS users mailling list" <users at lists.opensips.org>,
> james at ip-sentinel.com
> *Sent: *Monday, May 11, 2020 6:19:50 AM
> *Subject: *Re: [OpenSIPS-Users] OpenSIPS as Teams SBC
>
> I agree completely with Ovidiu.
> The Microsoft documentation says to use a FQDN in the Contact header, but
> this is wrong when the SBC is acting as a SIP Proxy.
> The blog post on the OpenSIPS website explains that actually the
> Record-Route header needs the FQDN.
> The one exception to this is the handling of OPTIONS pings - for these,
> OpenSIPS is the end point so it must use a FQDN in Contact.
>
> If you change the Contact header in call setup then you risk breaking the
> path for sequential requests, such as ACK.
> If ACK does not reach its destination, the call drops at one end after
> about
> 20 seconds - exactly what you are seeing.
>
> I have not yet found a good way to capture TLS encoded SIP. In theory, you
> can use sngrep with the -k option to identify the path to the private key
> file.
> It would be necessary to start sngrep first, then start (or restart)
> OpenSIPS. However, this never works for me.
> I had more success using the siptrace module to capture the packets to a DB
> table. Presenting it as a sequence diagram may be possible using the
> OpenSIPS Control Panel.
> Wireshark also has the ability to capture, decode and present TLS encrypted
> SIP.
> Another option might be to mirror the traffic to Homer in HEP format and
> then use Homer to create the sequence diagram.
>
> John Quick
> Smartvox Limited
>
>
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-- 
VoIP Embedded, Inc.
http://www.voipembedded.com
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