Yes, Kamailio just send MS refer to FS. 
In my opinion it is MS related, because their REFER is weird. This list have members who did MS integration with Kamailio. That is why I would like to ask if you get attended (consult), transfer working with MS (with refer or without refer - it doesn't matter). Do you handle refer at kamailio somehow?

чт, 14 мая 2020 г., 23:02 David Villasmil <david.villasmil.work@gmail.com>:
This looks Fs-related, not kamailio.

On Thu, 14 May 2020 at 20:25, Yuriy Nasida <ynasida@gmail.com> wrote:
I do not want MS to initiate a separate call leg. I want to get attended (consult) transfer. I call from A to B. Next call from A to C. Next, I want transfer B to C. 
 B and C is pstn numbers (i.e. not MS side).

I expect 2 variants:

1) Without REFER support at kamailio. I expect MS just will do transfer B-->C  at MS side. But MS send one more INVITE to C Instead of this.  i.e. C side already has the call. I do transfer and.. C side gets one more call instead of transfer.
 
2) Kamilio support REFER and send it to FS. FS should transfer such call inside itself (like it does for REFERs from zoiper or other usual softphones).
But... MS sends weird REFER and FS can not handle it it the same way like FS does for zoiper.

Please advice.







On Thu, 14 May 2020 at 18:39, Sergiu Pojoga <pojogas@gmail.com> wrote:
Remove the REFER from Supported header if you want MS to initiate a separate call leg, it's described in the direct dialing documentation.

Cheers. 

On Thu, May 14, 2020, 11:14 AM Yuriy Nasida, <ynasida@gmail.com> wrote:
Well, I saw similar questions in the list already but looks like nobody has answer.

Please look at REFER below.

Kamilio get REFER from MS and sends it to FS node. Next, FS node try to make 3th call for some reason.I expect that FS will not do 3th call and just will connect Alice and Bob itself.


2020/05/14 12:32:00.637027 KAM_IP:5060 -> FS_IP:5060
REFER sip:Alice_number@FS_IP:5060;transport=udp SIP/2.0
FROM: Customer1<sip:MS_TRUNK_NUMBER@sip.pstnhub.microsoft.com:5061;user=phone>;tag=a860c50a3fb54d08b4e5740fa2dfb3d6
TO: <sip:Alice_number@FQDN_OF_TRUNK:5061>;user=phone;tag=e8ct9S6ty13va
CSEQ: 4 REFER
CALL-ID: 2c71b2a6669b5343a231e1244b19c945
MAX-FORWARDS: 50
Via: SIP/2.0/UDP FQDN_OF_TRUNK:5060;branch=z9hG4bK10ae.2c42897feca117121a23bf0c8d54cd19.0;i=c
VIA: SIP/2.0/TLS 52.114.75.24:5061;branch=z9hG4bK7e3e8998
CONTACT: <sip:api-du-a-euwe.pstnhub.microsoft.com:443;x-i=6b68e7aa-f5e2-44ec-9edf-0bacbabfce07;x-c=2c71b2a6669b5343a231e1244b19c945/d/8/b68f86794a8e44d19543f8edbee6b2fc
CONTENT-LENGTH: 0
REFER-TO: <sip:Bob_number@sip.pstnhub.microsoft.com:5061;user=phone;transport=tls>
REFERRED-BY: <sip:sip.pstnhub.microsoft.com:5061;x-m=8:orgid:21bc47d3-c050-4292-8234-46f7005b97aa;x-t=fb788ef8-3c4c-455a-8d62-f3c20832c0d3;x-ti=6b68e7aa-f5e2-44ec-9edf-
acbabfce07;x-tt=aHR0cHM6Ly9hcGktZHUtYS1ldXdlLnBzdG5odWIubWljcm9zb2Z0LmNvbS92MS9uZ2MvY2FsbG5vdGlmaWNhdGlvbj9kY2k9YzIxMjE3MzEyNTQ2NDk1ZjlhYTcwODliYTkwNGIxZGQ%3D>
USER-AGENT: Microsoft.PSTNHub.SIPProxy v.2020.5.6.2 i.EUWE.4
ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
P-ASSERTED-IDENTITY: <tel:MS_TRUNK_NUMBER>,<sip:customer1@m365x587912.onmicrosoft.com>
PRIVACY: id
X-AUTH-IP: 52.114.75.24
X-AUTH-PORT: 3136


Any advice? 




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