SIP/2.0 200 OK
Via: SIP/2.0/UDP nm;branch=foo;rport=26810;received=224.66.54.178
From: <sip:nm@nm>;tag=root
To: <sip:nm2@nm2>;tag=XNXccveUt6rBQ
Call-ID: 50000
CSeq: 42 OPTIONS
Contact: <sip:197.248.0.196>
User-Agent: FreeSWITCH-mod_sofia/1.10.1-release+git~20191231T140119Z~f7bdd3845a~64bit
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Length: 0