U 8.3.22.115:5060 -> 66.250.68.194:5060
  INVITE sip:888@66.250.68.194;user=phone SIP/2.0..Via: SIP/2.0/UDP 8.3.22.115:5060;branch=z9hG4bK4cb5f359;rport..From: "1001" <sip:1001@8.3.22.115>;t
  ag=as1d51d070..To: <sip:888@66.250.68.194;user=phone>..Contact: <sip:1001@8.3.22.115>..Call-ID: 1eb64895612218cf4719f7cb5f7e4749@8.3.22.115..CSeq: 1
  02 INVITE..User-Agent: Asterisk PBX (ScopServ)..Max-Forwards: 70..Remote-Party-ID: "1001" <sip:1001@8.3.22.115>;privacy=off;screen=no..Date: Thu, 02
   Nov 2006 19:23:46 GMT..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY..Content-Type: application/sdp..Content-Length: 307....v=
  0..o=root 8651 8651 IN IP4 8.3.22.115..s=session..c=IN IP4 8.3.22.115..t=0 0..m=audio 10248 RTP/AVP 0 3 8 101..a=rtpmap:0 PCMU/8000..a=rtpmap:3 GSM/
  8000..a=rtpmap:8 PCMA/8000..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-16..a=silenceSupp:off - - - -..m=video 12852 RTP/AVP 34..a=rtpmap:34 H26
  3/90000..
#
U 66.250.68.194:5060 -> 8.3.22.115:5060
  SIP/2.0 407 Proxy Authentication Required..Via: SIP/2.0/UDP 8.3.22.115:5060;branch=z9hG4bK4cb5f359;received=8.3.22.115;rport=5060..From: "1001" <sip
  :1001@8.3.22.115>;tag=as1d51d070..To: <sip:888@66.250.68.194;user=phone>;tag=as607b53ae..Call-ID: 1eb64895612218cf4719f7cb5f7e4749@8.3.22.115..CSeq:
   102 INVITE..User-Agent: bkw.org/1.2..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY..Contact: <sip:888@66.250.68.194>..Proxy-Au
  thenticate: Digest realm="bkw.org", nonce="73068ae5"..Content-Length: 0....
#
U 8.3.22.115:5060 -> 66.250.68.194:5060
  ACK sip:888@66.250.68.194;user=phone SIP/2.0..Via: SIP/2.0/UDP 8.3.22.115:5060;branch=z9hG4bK4cb5f359;rport..From: "1001" <sip:1001@8.3.22.115>;tag=
  as1d51d070..To: <sip:888@66.250.68.194;user=phone>;tag=as607b53ae..Contact: <sip:1001@8.3.22.115>..Call-ID: 1eb64895612218cf4719f7cb5f7e4749@8.3.22.
  115..CSeq: 102 ACK..User-Agent: Asterisk PBX (ScopServ)..Max-Forwards: 70..Remote-Party-ID: "1001" <sip:1001@8.3.22.115>;privacy=off;screen=no..Cont
  ent-Length: 0....