Hi, everyone. I'm testing a SIP cable modem with asterisk. The REGISTER packet it sends has varios "Authorization" sections, which I have never seen before. Asterisk sends back "401 Unauthorized". I've checked username and password both in cable modem config and in asterisk sip.conf. They are correct. So, is the reason for "401 Unauthorized" those multiple "Authorization" sections? If anyone is more or less familiar with SIP, please could you take a look at the packet trace below. Is it ok? Thanks in advance. 15:06:48.346157 IP 10.2.0.63.5060 > 192.168.0.4.5060: UDP, length 1345 E..]\...?.O. ..?.........I".REGISTER sip:192.168.0.4 SIP/2.0 From: 968953939<sip:968953939 at localhost>;tag=94b7ef58-a02003f-13c4-45026-20-3eb775bd-20 To: 968953939<sip:968953939 at localhost> Call-ID: 94b7b630-a02003f-13c4-45026-20-6733142f-20 CSeq: 9898 REGISTER Via: SIP/2.0/UDP 10.2.0.63:5060;branch=z9hG4bK-63b06-185692fe-78a7e24 Max-Forwards: 70 Supported: timer,replaces,join,100rel User-Agent: ARRIS-TM501B release v.05.02.0X SN/0015960DBC24 Contact: 968953939<sip:968953939 at 10.2.0.63:5060> Authorization: Digest username="968953939",realm="asterisk",nonce="5e8e5c3a",uri="sip:192.168.0.4",response="918f7f23dd8ae8e8fc9465940e8914db",algorithm=MD5 Authorization: Digest username="968953939",realm="asterisk",nonce="5f3ff920",uri="sip:192.168.0.4",response="d3acf42b9afa65708936b525bb912f36",algorithm=MD5 Authorization: Digest username="968953939",realm="asterisk",nonce="60b3eb72",uri="sip:192.168.0.4",response="715c6da5586490ee90f16b39f57b98ac",algorithm=MD5 Authorization: Digest username="968953939",realm="asterisk",nonce="637cb9c0",uri="sip:192.168.0.4",response="49a55de9aab1776c1f7f081465a8c593",algorithm=MD5 Authorization: Digest username="968953939",realm="asterisk",nonce="2d73aae7",uri="sip:192.168.0.4",response="1dd245c05ade19d7d4fc85c21e5e86fe",algorithm=MD5 Allow: INVITE,ACK,BYE,CANCEL,NOTIFY,PRACK,UPDATE,OPTIONS Content-Length: 0