[asterisk-dev] Strange SIP packet

[fadey]

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