<--- SIP read from UDP:xxx.xxx.xxx.xxx:xxxx --->
INVITE sip:8xxxxxxxxx@xxx.xxx.xxx.xxx:xxxx;user=phone SIP/2.0
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,INFO,PRACK,REFER,SUBSCRIBE,NOTIFY,UPDATE
Via: SIP/2.0/UDP xxx.xxx.xxx.xxx:xxxx;branch=z9hG4bK2bbb0fd13adbdb00
From: "110" <sip:110@xxx.xxx.xxx.xxx>;tag ...