FPBX14.0.17(16.4.1)

SIP/2.0 200 OK
Via: SIP/2.0/UDP nm;branch=foo;received=224.31.253.154;rport=26810
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=as27b74b07
Call-ID: 50000
CSeq: 42 OPTIONS
Server: FPBX-14.0.17(16.4.1)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Contact: <sip:170.199.244.119:5060>
Accept: application/sdp
Content-Length: 0