I've tried the transfers and certainly Teams doesn't manage it correctly. As you said before, if Kamailio allows REFER messages, Teams send all transfers to Kamailio. If Kamailio doesn't allow REFER messages, Teams manage the transfers. But there is a problem with transfers between Teams users:

Case 1: transfers managed by Teams:

Internal transfers (between Teams users) are managed by Teams and works fine. It is the same that the initial call is inbound or outbound ... for example: 
- Call from a mobile -> SBC -> Teams user -> Transfer to another Teams user
- Teams user -> SBC -> External number -> Transfer to another Teams user

The problem is when the Teams users want to transfer to another external number. In this case the transfer fails because Teams doesn't manage it correctly (it is the same for attended or blind transfers).

Case 2: transfers managed by Kamailio:

Transfers to external numbers are managed by Kamailio and works fine:
REFER-TO: <sip:XXXXXXXXX@sip.pstnhub.microsoft.com:5061;user=phone;transport=tls>

The problem is when you want to transfer to another Teams user, because the username in the REFER-TO header is empty:
REFER-TO: <sip:sip.pstnhub.microsoft.com:5061;user=phone;transport=tls>

The extension number of the Teams user is not sent by Teams in any header and Kamailio doesn't know which is the destination number for the transfer.

Have you found any solution for that?

Regards

On Wed, 3 Feb 2021 at 21:31, Davide Zanichelli <dav.zanichelli@gmail.com> wrote:
Ah ok so Also for inbound , i dont know why teams send me a refer !


Il giorno mer 3 feb 2021 alle 20:04 Pepelux <pepeluxx@gmail.com> ha scritto:
I'm talking about inbound calls ...

PSTN -> Kamailio -> Teams ... and transfer to another Teams user

I remember that Teams was sending me the transfer until I changed header removing REFER from ALLOW

Kamailio support REFER but I couldn't get it to work with Teams 

On Wed, 3 Feb 2021 at 19:08, Davide Zanichelli <dav.zanichelli@gmail.com> wrote:
Yes 
But for inbound calls i dont know why 
Teams send me a REFER !

Do your know  if kamailio support Refer transfer ?

Thanks 

Davide 

Il giorno mer 3 feb 2021 alle 15:27 Pepelux <pepeluxx@gmail.com> ha scritto:
I use something similar and all transfers between Teams users work fine:

onreply_route[PBX_REPLY_TO_TEAMS] {
        subst('/^Allow:\s(.*)\,\sREFER(.*)$/Allow:\s\1\2/ig');

Teams thinks that we don't support the refer method and it manages the transfers. 

I have not tried the external transfers but I think if the SBC rules are ok, it must be managed by Teams.

Regards


On Wed, 3 Feb 2021 at 12:00, Davide Zanichelli <dav.zanichelli@gmail.com> wrote:
Outbound call transfer fixed !

if can helps :

        if(status=="200"){
        remove_hf("ALLOW:");
        append_hf("ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY \r\n", "CONTENT-TYPE");
        }

last but not least i need to fix transfer for incoming calls 

so in my case i use rtpengine for manage RTP > SRTP conversion ..
so my issue in if i try to transfer pbx send me "not acceptable here" 
if i remove ice PBX accept the INVITE but Teams require SRTP,
so does anyone know how to get it to work ?



Thanks you !!!

Davide



Il giorno ven 29 gen 2021 alle ore 12:53 Davide Zanichelli <dav.zanichelli@gmail.com> ha scritto:

Direct Routing supports two methods for call transfer:

  • Option 1. SIP proxy processes Refer from the client locally and acts as a Referee as described in section 7.1 of RFC 3892.

    With this option, the SIP proxy terminates the transfer and adds a new Invite.

  • Option 2. SIP proxy sends the Refer to the SBC and acts as a Transferor as describing in Section 6 of RFC 5589.

    With this option, the SIP proxy sends a Refer to the SBC and expects the SBC to handle the Transfer fully.

The SIP proxy selects the method based on the capabilities reported by the SBC. If the SBC indicates that it supports the method “Refer”, the SIP proxy will use Option 2 for call transfers.

The following is an example of an SBC sending the message that the Refer method is supported:

Console
ALLOW: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY

If the SBC doesn’t indicate that Refer as a supported method, Direct Routing will use Option 1 (SIP proxy acts as a Referee) . The SBC must also signal that it supports the Notify method:

Example of SBC indicating that Refer method is not supported:

Console
ALLOW: INVITE, ACK, CANCEL, BYE, INFO, NOTIFY, PRACK, UPDATE, OPTIONS


so i try to add "REFER" in the allow ì: heder but still no luck 
Davide

Il giorno ven 29 gen 2021 alle ore 11:24 Davide Zanichelli <dav.zanichelli@gmail.com> ha scritto:
Ok thanks

My issue is when i try to transfer a call to esternal user 
Thanks

Il giorno ven 29 gen 2021 alle 11:10 Pepelux <pepeluxx@gmail.com> ha scritto:
I think Teams doesn't send REFER messages. Transfers are managed directly by Teams. When you transfer a call you can send to a Team user instead to a SIP extension.

Regards

On Fri, 29 Jan 2021 at 10:55, Davide Zanichelli <dav.zanichelli@gmail.com> wrote:
Hello

Now inbound and outbound works as expected!
But i have a issue during the call transfer.


transfer fail and i dont receive REFER from Teams 

Does someone know how to manage re invite and refer with Teams ? 

Any advice are welcome
Thanks you 

Il giorno mer 27 gen 2021 alle 09:07 Davide Zanichelli <dav.zanichelli@gmail.com> ha scritto:
Hello 

im still having trouble with ack and bye ...

in inbound call my teams client stuck in "calling"

and seems that dont like my ack


====================
tag: snd
pid: 131292
process: 6
time: 1611683788.220244
date: Tue Jan 26 17:56:28 2021
proto: tls ipv4
srcip: 69.172.96.197
srcport: 5061
dstip: 52.114.75.24
dstport: 5061
~~~~~~~~~~~~~~~~~~~~
ACK sip:+1010@sip.pstnhub.microsoft.com:5061;transport=tls SIP/2.0
Record-Route: <sip:kml.call2teams.io:5061;transport=tls;r2=on;ftag=DKU70jvS4K86p;lr>
Via: SIP/2.0/TLS 69.172.96.197:5061;branch=z9hG4bKaf91.b6d38c1afb72b2dd4847cc3f7d99d698.0
v:SIP/2.0/UDP 185.132.68.116;received=185.132.68.116;rport=5060;branch=z9hG4bKZXc92a9KDyUFg
Max-Forwards:69
f:"Davide Zanichelli"<sip:3454558075@185.132.68.116>;tag=DKU70jvS4K86p
t:<sip:+1010@sip.pstnhub.microsoft.com:5061>;tag=25f6b5d613cb478aa1d495a391860101
i:9493b287-a2f6-4891-859c-231994af46d6
CSeq:31288100 ACK

Il giorno gio 21 gen 2021 alle ore 09:18 Davide Zanichelli <dav.zanichelli@gmail.com> ha scritto:
Hello
i dont understand why teams reply me 481 !!!

Thanks 
davide

||||||||||||||||||||
====================
tag: snd
pid: 102385
process: 6
time: 1611216424.610918
date: Thu Jan 21 08:07:04 2021
proto: tls ipv4
srcip: 69.172.96.197
srcport: 5061
dstip: 52.114.75.24
dstport: 5061
~~~~~~~~~~~~~~~~~~~~
BYE sip:+1010@sip.pstnhub.microsoft.com:5061;transport=tls SIP/2.0
Record-Route: <sip:kml.call2teams.io:5061;transport=tls;r2=on;ftag=7NFv9B0B3K6QB;lr>
Record-Route: <sip:69.172.96.197:5060;r2=on;ftag=7NFv9B0B3K6QB;lr>
Via: SIP/2.0/TLS 69.172.96.197:5061;branch=z9hG4bK02e5.5f6af95bad6e683b84ebf07b31a7755f.0
v:SIP/2.0/UDP 185.132.68.116;received=185.132.68.116;rport=5060;branch=z9hG4bK9j0gNmmXj9Q6D
Max-Forwards:69
f:"Davide Zanichelli"<sip:3454558075@185.132.68.116>;tag=7NFv9B0B3K6QB
t:<sip:+1010@sip.pstnhub.microsoft.com:5061;user=phone>;tag=da13ee6f8a0f4277b597fa9fd40a783f
i:781214b3-d662-1239-fc81-9259e6a86632
CSeq:31054416 BYE
User-Agent:FreeSWITCH-mod_sofia/1.6.20~64bit
Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,PRACK,NOTIFY,PUBLISH,SUBSCRIBE
k:precondition,100rel,path,replaces
Reason:Q.850;cause=16;text="NORMAL_CLEARING"
l:0

||||||||||||||||||||
====================
tag: rcv
pid: 102417
process: 38
time: 1611216424.629297
date: Thu Jan 21 08:07:04 2021
proto: tls ipv4
srcip: 52.114.75.24
srcport: 5061
dstip: 69.172.96.197
dstport: 5061
~~~~~~~~~~~~~~~~~~~~
SIP/2.0 481 Call Leg/Transaction Does Not Exist
FROM: "Davide Zanichelli"<sip:3454558075@185.132.68.116>;tag=7NFv9B0B3K6QB
TO: <sip:+1010@sip.pstnhub.microsoft.com:5061;user=phone>;tag=da13ee6f8a0f4277b597fa9fd40a783f
CSEQ: 31054416 BYE
CALL-ID: 781214b3-d662-1239-fc81-9259e6a86632
VIA: SIP/2.0/TLS 69.172.96.197:5061;branch=z9hG4bK02e5.5f6af95bad6e683b84ebf07b31a7755f.0,SIP/2.0/UDP 185.132.68.116;received=185.132.68.116;branch=z9hG4bK9j0gNmmXj9Q6D;rport=5060
REASON: Q.850;cause=95;text="90301fea-2875-4a99-b6f0-25e35ff07710;Call leg unavailable"
CONTENT-LENGTH: 0
ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
SERVER: Microsoft.PSTNHub.SIPProxy v.2021.1.15.7 i.EUWE.8

Il giorno mer 20 gen 2021 alle ore 18:03 Richard Fuchs <rfuchs@sipwise.com> ha scritto:
On 19/01/2021 07.11, Daniel-Constantin Mierla wrote:
> Hello,
>
> I built rtpengine deb packages for debian just a few days ago and all
> went fine. I used the file mr8.5.1.5.tar.gz from the github releases
> of rtpengine project.
>
> However, I noticed that some past releases fail to build because of
> the tests. I had to edit a bit the Makefile to disable the tests target.

If some of the tests are causing a problem, you can let me know and I'll
see if they can be defused to make things work for everybody.

Cheers


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