<--- SIP read from UDP:192.168.1.15:5060 --->
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.2.17:5060;branch=z9hG4bK7bad8356;received=192.168.2.17;rport=1732
From: <sip:pope@192.168.1.15>;tag=as503efb5c
To: <sip:pope@192.168.1.15>;tag=as6a16a349
Call-ID: 36159e18312e4ee130141a5e1abcae4c@127.0.0.1
CSeq: 102 REGISTER
Server: Asterisk PBX 1.8.19.1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="25813d13"
Content-Length: 0