its been about one month for me playing with kamailio and I need some help to sort out a real life situation.

I followed this guide https://skalatan.de/en/blog/kamailio-sbc-teams; great article, also got some inspiration from here https://blog.opensips.org/2019/09/16/opensips-as-ms-teams-sbc/..articles look very similar.

I manged to get my calls out to kamailio from TEAMS it works perfectly call gets connected and  codec negotiation is fine, but I am facing issue geting the call inbound to TEAMS.

My invite looks like this:

========================

U 217.26.163.205:5060 -> 52.114.75.24:5061 #22
INVITE sip:+37360844269@sip.pstnhub.microsoft.com:5061 SIP/2.0.
Record-Route: <sip:sbc.pride.md:5061;transport=tls;lr>.
Record-Route: <sip:217.26.163.205:5061;nat=yes;lr>.
Via: SIP/2.0/UDP 217.26.163.205;branch=z9hG4bK7838.7417f50ed201fcada9609f5b7c4e520f.0.
Via: SIP/2.0/UDP 192.168.169.102:5060;received=46.214.187.67;branch=z9hG4bK80e3f7e5cc50ea11806b6eeeb899592c;rport=5060.
From: "+37379844267" <sip:+37379844267@sbc.pride.md>;tag=1604785394.
To: "+37360844269" <sip:+37360844269@sip.pstnhub.microsoft.com:5061;user=phone>.
Call-ID: 80E3F7E5-CC50-EA11-8069-6EEEB899592C@192.168.169.102.
CSeq: 227 INVITE.
sip:+37379844267@192.168.169.102:5060;gr=008A94E3-CA50-EA11-805B-6EEEB899592C;alias=46.214.187.67~5060~1Content-Type: application/sdp.
Allow: INVITE, ACK, BYE, CANCEL, INFO, MESSAGE, NOTIFY, OPTIONS, REFER, UPDATE, PRACK.
Max-Forwards: 69.
User-Agent: SIPPER for PhonerLite.
Session-Expires: 1800.
Supported: 100rel, replaces, from-change, gruu, timer.
P-Preferred-Identity: <sip:+37379844267@sbc.pride.md>.
Content-Length:   362.
Contact: <sip:+37379844267@sbc.pride.md:5061;user=phone;transport=tls>.
.
v=0.
o=- 2307737351 1 IN IP4 217.26.163.205.
s=SIPPER for PhonerLite.
c=IN IP4 217.26.163.205.
t=0 0.
m=audio 36864 RTP/SAVP 8 101.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:owGy5+mMZNyO5+9lFmUUOK3WqpEsxJH0+jtWz

===============================================

Anybody has a good invite exaple for Teams?

Or do you see any issue with my invite? I do use :

 record_route_preset("sbc.pride.md:5061;transport=tls","217.26.163.205:5060;nat=yes");
 add_rr_param(";r2=on");

before sending this out.

Please let me know if you can help.

Thanks.

Vitalie.