[harmeet@localhost ~]$ sudo /usr/sbin/ngrep -i -q sip Password: interface: eth0 (74.210.101.0/255.255.255.0) match: sip U 74.107.61.218:9754 -> 74.210.101.64:5060 REGISTER sip:74.210.101.64 SIP/2.0..Via: SIP/2.0/UDP 192.168.1.101 ;rport;br anch=z9hG4bKjdublyua..Max-Forwards: 70..To: "Harmeet Ubuntu" ..From: "Harmeet Ubuntu" < sip:1003@74.210.101.64>;tag=thlxr..Call -ID: drkpcgluyktagrv@192.168.1.101..CSeq: 487 REGISTER..Contact: ;expires=3600..Allow: INVITE,ACK,BYE,CANCEL,OPTIONS,PRACK,REF ER,NOTIFY,SUBSCRIBE,INFO..User-Agent: Twinkle/1.0..Content-Length: 0.... U 74.210.101.64:5060 -> 74.107.61.218:9754 SIP/2.0 100 Trying..Via: SIP/2.0/UDP 192.168.1.101;rport=9754;branch=z9hG4b Kjdublyua;received=74.107.61.218..To: "Harmeet Ubuntu" ..From: "Harmeet Ubuntu" < sip:1003@74.210.101.64>;tag=thlxr..Call-ID: d rkpcgluyktagrv@192.168.1.101..CSeq: 487 REGISTER..Server: Sip EXpress route r (0.9.6 (i386/linux))..Content-Length: 0..Warning: 392 74.210.101.64:5060 "Noisy feedback tells: pid=4367 req_src_ip=74.107.61.218 req_src_port=9754 in_uri=sip: 74.210.101.64 out_uri=sip:74.210.101.64 via_cnt==1".... U 74.210.101.64:5060 -> 74.107.61.218:9754 SIP/2.0 401 Unauthorized..Via: SIP/2.0/UDP 192.168.1.101;rport=9754;branch= z9hG4bKjdublyua;received=74.107.61.218..To: "Harmeet Ubuntu" < sip:1003@74.2 10.101.64>;tag=702ce350076e51face9e034317110ed6.b960..From: "Harmeet Ubuntu " ;tag=thlxr..Call-ID: drkpcgluyktagrv@192.168.1.10 1..CSeq: 487 REGISTER..WWW-Authenticate: Digest realm="74.210.101.64", nonc e="46d89269e43e893bc44ecfd1f8ff602ba8d30be8"..Server: Sip EXpress router (0 .9.6 (i386/linux))..Content-Length: 0..Warning: 392 74.210.101.64:5060 "Noi sy feedback tells: pid=4367 req_src_ip=74.107.61.218 req_src_port=9754 in_ uri=sip:74.210.101.64 out_uri=sip:74.210.101.64 via_cnt==1".... U 74.107.61.218:9754 -> 74.210.101.64:5060 REGISTER sip:74.210.101.64 SIP/2.0..Via: SIP/2.0/UDP 192.168.1.101;rport;br anch=z9hG4bKrlzssspd..Max-Forwards: 70..To: "Harmeet Ubuntu" < sip:1003@74.2 10.101.64>..From: "Harmeet Ubuntu" ;tag=thlxr..Call -ID: drkpcgluyktagrv@192.168.1.101 ..CSeq: 488 REGISTER..Contact: ;expires=3600..Authorization: Digest username="1003",realm="7 4.210.101.64 ",nonce="46d89269e43e893bc44ecfd1f8ff602ba8d30be8",uri="sip:74. 210.101.64",response="ce889b05c76486b101458767c7f6d6e6",algorithm=MD5..Allo w: INVITE,ACK,BYE,CANCEL,OPTIONS,PRACK,REFER,NOTIFY,SUBSCRIBE,INFO..User-Ag ent: Twinkle/1.0..Content-Length: 0.... U 74.210.101.64:5060 -> 74.107.61.218:9754 SIP/2.0 100 Trying..Via: SIP/2.0/UDP 192.168.1.101;rport=9754;branch=z9hG4b Krlzssspd;received=74.107.61.218..To: "Harmeet Ubuntu" ..From: "Harmeet Ubuntu" < sip:1003@74.210.101.64>;tag=thlxr..Call-ID: d rkpcgluyktagrv@192.168.1.101..CSeq: 488 REGISTER..Server: Sip EXpress route r (0.9.6 (i386/linux))..Content-Length: 0..Warning: 392 74.210.101.64:5060 "Noisy feedback tells: pid=4369 req_src_ip=74.107.61.218 req_src_port=9754 in_uri=sip: 74.210.101.64 out_uri=sip:74.210.101.64 via_cnt==1".... U 74.210.101.64:5060 -> 74.107.61.218:9754 SIP/2.0 200 OK..Via: SIP/2.0/UDP 192.168.1.101;rport=9754;branch=z9hG4bKrlz ssspd;received=74.107.61.218..To: "Harmeet Ubuntu" < sip:1003@74.210.101.64> ;tag=702ce350076e51face9e034317110ed6.9070..From: "Harmeet Ubuntu" ;tag=thlxr..Call-ID: drkpcgluyktagrv@192.168.1.101 ..CSeq: 4 88 REGISTER..Contact: ;expires=3600;received="sip:7 4.107.61.218:9754"..Server: Sip EXpress router ( 0.9.6 (i386/linux))..Conten t-Length: 0..Warning: 392 74.210.101.64:5060 "Noisy feedback tells: pid=43 69 req_src_ip=74.107.61.218 req_src_port=9754 in_uri=sip:74.210.101.64 out_ uri=sip:74.210.101.64 via_cnt==1"....