[SR-Users] MSTeams Kamailio with PBX Hold Refer issue

[me.projects at yahoo.com]

Hi, I have been trying to integrate MSTeams with PBX Through Kamailio. Calls are working now. Hold has Issues. MSTeams uses REFER to manage this all with NOTIFY. 
I am sending t_send_reply("202", "Accepted");
when receive Refer now I need to send NOTIFY I think I can use t_uac_send() NOTIFY I am unable to send t_uac_send properly on when recertifications refer from MSTeams.
Any one with the experience on this ?
Thanks,
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