register => tls://first.m.last@domain.com:PASSWORD:AD\username@sip.example.com/from-ocs


IP information:
sip.example.com == 192.168.0.1
my asterisk server == 192.168.0.2


       > doing dnsmgr_lookup for 'sip.example.com'
REGISTER 10 headers, 0 lines
Reliably Transmitting (no NAT) to 192.168.0.1:5061:
REGISTER sip:example.com SIP/2.0
Via: SIP/2.0/TLS 192.168.0.2:5061;branch=z9hG4bK0c1fbb6d
Max-Forwards: 70
From: <sip:first.m.last@example.com>;tag=as3d8b8c33
To: <sip:first.m.last@example.com>
Call-ID: 7f26d5ce62a8745716a9ed2a62917fd2@192.168.0.2
CSeq: 104 REGISTER
User-Agent: Asterisk PBX 1.8.3.2-1digium1~lucid
Expires: 120
Contact: <sip:from-ocs@192.168.0.2:5061;transport=TLS>
Content-Length: 0


---
[Apr 14 16:48:05] NOTICE[16267]: chan_sip.c:12232 sip_reg_timeout:    -- Registration for 'first.m.last@sip.example.com' timed out, trying again (Attempt #3)
Really destroying SIP dialog '7f26d5ce62a8745716a9ed2a62917fd2@192.168.0.2' Method: REGISTER