[Freeswitch-users] Teams direct routing

[Brian :]

HI Flavio,

Hope you are well!

MS Have actually well documented this ( odd ) behaviour.

Essentially the TLDR is turn off REFER support on all your invites and
replies to MS if you don't want go down want to have to do a bit of
work to support their refer format.

If you do want to get REFER working the relevant bits are from MS are
below ( they refer to the sip proxy - thats an MS sip proxy - you are
the SBC )

If the call is transferred from one Teams user to another via the SBC,
the SBC is expected to issue a new invite (start a new dialog) for the
transfer target (the Teams user) using the information received in the
Refer message.

To populate the To/Transferor fields for the transaction of the
request internally, the SIP proxy needs to convey this information
inside the REFER-TO/REFERRED-BY headers.

The SIP proxy will form the REFER-TO as a SIP URI comprised of a SIP
proxy FQDN in the hostname and either one of the following:

An E.164 phone number in the username part of the URI in case the
transfer target is a phone number, or

x-m and x-t parameters encoding the full transfer target MRI and
tenant ID respectively

The REFERRED-BY header is a SIP URI with transferor MRI encoded in it
as well as transferor tenant ID and other transfer context parameters
as shown in the following table:

TABLE 3
ParameterValueDescription
x-mMRIFull MRI of transferor/transfer target as populated by CC
x-tTenant IDx-t Tenant ID Optional Tenant Id as populated by CC
x-tiTransferor Correlation IdCorrelation Id of the call to the transferor
x-ttTransfer target call URIEncoded call replacement URI

Its all documented at:
https://docs.microsoft.com/en-us/microsoftteams/direct-routing-protocols-sip


Brian.

On Mon, Jun 15, 2020 at 10:51 PM Flavio Goncalves <flavio at voffice.com.br> wrote:
>
> Hi,
>
> I've managed to connect teams using FS, now I´m trying to implement call hold and call transfer. Teams use an unusual way for hold, it transfers the call. In the refer I can see the refer-to pointing to an url without a request uri user
>
> REFER-TO: <sip:sip.pstnhub.microsoft.com:5061;transport=tls;x-m=8:orgid:e83c0390-43cb-4c40-8d09-8a972709235b;x-t=9c36cf22-e6e8-4792-b823-873069b82489>
>
> How can I bridge a call to an URI without a request uri user?
>
> I tried sofia/gateway/ms1/ (without passing a user).
> I tried <action application="export" data="nolocal:sip_invite_req_uri=$1;$2"/>
>
> where $1 is the domain and $2 are the invite parameters
>
> but no success.
>
> Did anyone have success with TEAMS and call hold, call transfer?
>
> Thanks
>
> Flavio E Goncalves
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