Mine

<--- SIP read from 192.168.100.20:5060 --->
REGISTER sip:192.168.100.28:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.102;branch=z9hG4bKb55240d4139A1DFB
From: "Keisha Strickler" <sip:1023@192.168.100.28>;tag=213E9627-8AF9B2D6
To: <sip:1023@192.168.100.28>
CSeq: 1 REGISTER
Call-ID: 7fa5f8a-daad3141-7ef588e0@192.168.1.102
Contact: <sip:1023@192.168.1.102>;methods="INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER"
User-Agent: PolycomSoundPointIP-SPIP_550-UA/2.1.0.2708
Max-Forwards: 70
Expires: 3600
Content-Length: 0


<------------->
--- (11 headers 0 lines) ---
Using latest REGISTER request as basis request
Sending to 192.168.1.102 : 5060 (no NAT)

<--- Transmitting (no NAT) to 192.168.1.102:5060 --->
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.1.102;branch=z9hG4bKb55240d4139A1DFB;received=192.168.100.20
From: "Keisha Strickler" <sip:1023@192.168.100.28>;tag=213E9627-8AF9B2D6
To: <sip:1023@192.168.100.28>
Call-ID: 7fa5f8a-daad3141-7ef588e0@192.168.1.102
CSeq: 1 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:1023@192.168.100.28>
Content-Length: 0


<------------>

<--- Transmitting (no NAT) to 192.168.1.102:5060 --->
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.1.102;branch=z9hG4bKb55240d4139A1DFB;received=192.168.100.20
From: "Keisha Strickler" <sip:1023@192.168.100.28>;tag=213E9627-8AF9B2D6
To: <sip:1023@192.168.100.28>;tag=as0c17e7e5
Call-ID: 7fa5f8a-daad3141-7ef588e0@192.168.1.102
CSeq: 1 REGISTER
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="497a7c67"
Content-Length: 0