Sip peer UNREACHABLE - Jain sip integration

Hello,
I have a problem with registering some sip accounts to asterisk. I use jain sip java library for this purpose. I managed to send REGISTER request to the asterisk server, authenticate the user and receive a valid 200 response. But when I list the peers in asterisk (sip show peers) I see the account as UNREACHABLE:

634/john.smith 10.0.7.160 D Yes Yes 6060 UNREACHABLE

This is my register request:

REGISTER sip:634@10.0.0.***:5060 SIP/2.0
Call-ID: 39c724c90d0b1f1cd2f58f4b0d4c91d2@10.0.7.162
CSeq: 1 REGISTER
From: sip:634@10.0.0.:5060***;tag=-1934966774
To: sip:6034@10.0.0.:5060***
Via: SIP/2.0/UDP 10.0.7.160:6060;branch=z9hG4bK-323139-07ce7bdc8ce4213bb4160df0e40c00d7
Max-Forwards: 70
Contact: sip:6034@10.0.7.:6060***
Content-Length: 0

Then I get response that the user need authorization:

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.0.7.160:6060;branch=z9hG4bK-323139-07ce7bdc8ce4213bb4160df0e40c00d7;received=10.0.7.160;rport=6060
From: sip:634@10.0.0.:5060***;tag=-1934966774
To: sip:634@10.0.0.:5060***;tag=as73e21f42
Call-ID: 39c724c90d0b1f1cd2f58f4b0d4c91d2@10.0.7.162
CSeq: 1 REGISTER
Server: Asterisk PBX 11.14.2
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY,INFO,PUBLISH,MESSAGE
Supported: replaces,timer
WWW-Authenticate: Digest algorithm=MD5,realm=“asterisk”,nonce="705aa6c7"
Content-Length: 0

After authentication I get 200 response:

SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.0.7.160:6060;branch=z9hG4bK-323139-c354272cbd377608cb07b7d1ff473598;received=10.0.7.162;rport=6060
From: sip:634@10.0.0.:5060***;tag=-1934966774
To: sip:634@10.0.0.:5060***;tag=as03f78585
Call-ID: 39c724c90d0b1f1cd2f58f4b0d4c91d2@10.0.7.162
CSeq: 3 REGISTER
Server: Asterisk PBX 11.14.2
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY,INFO,PUBLISH,MESSAGE
Supported: replaces,timer
Expires: 120
Contact: sip:634@10.0.7.160:6060;expires=120
Date: Wed, 20 May 2015 11:22:01 GMT
Content-Length: 0

After that I check the peers and the account is unreachable.
I tried to set “nat=no” and disable the qualify option in users.conf
but still my account is UNREACHABLE.

Thank you!