INVITE sip:user@comapny.com SIP/2.0
To: sip:j.user@company.com
From: sip:caller@university.edu
Call-ID: 0ha0isndaksdj@10.0.0.1
CSeq: 8 INVITE
Via: SIP/2.0/UDP 135.180.130.133
Content-Type: application/newformat

<audio>
 <pcmu port="443"/>
</audio>