It looks like the challenge response after INVITE is not been accepted.
Provide more detail.
$> sip set debug peer sipgate
server*CLI> sip set debug peer sipgate
SIP Debugging Enabled for IP: 217.10.79.23:5060
Really destroying SIP dialog '3ef8ff1a6ec360626af409b112b860ee@127.0.1.1'
Method: REGISTER
-- Registered SIP 'xxxxx' at 86.140.115.135 port 5060
== Using SIP RTP CoS mark 5
== Using SIP VRTP CoS mark 6
-- Executing [01179553708@default:1] Set("SIP/xxxxx-0000015d",
"CALLERID(num)=xxxxx") in new stack
-- Executing [01179553708@default:2] Dial("SIP/xxxxx-0000015d",
"SIP/01179553708@sipgate,30,trg") in new stack
== Using SIP RTP CoS mark 5
== Using SIP VRTP CoS mark 6
-- Called 01179553708@sipgate
[Sep 19 10:50:15] NOTICE[28232]: chan_sip.c:17885 handle_response_invite:
Failed to authenticate on INVITE to '"xxxxx"
<sip:xx...@sipgate.co.uk>;tag=as629ee6f8'
-- SIP/sipgate-0000015e is circuit-busy
== Everyone is busy/congested at this time (1:0/1/0)
-- Executing [01179553708@default:3]
Hangup("SIP/xxxxx-0000015d", "") in new stack
== Spawn extension (default, 01179553708, 3) exited non-zero on
'SIP/xxxxx-0000015d'
---
server*CLI>
<--- SIP read from UDP:217.10.79.23:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 92.63.131.3:5060;branch=z9hG4bK73a1638c;rport=5060
From: "asterisk" <sip:asterisk@92.63.131.3>;tag=as5dcb32d8
To: <sip:sipgate.co.uk>;tag=99199803810c7e807ea44745826d9aa4.df2d
Call-ID: 65cb07675eefaaef5f655e8a0be6b2f6@92.63.131.3
CSeq: 102 OPTIONS
Accept: */*
Accept-Encoding:
Accept-Language: en
Supported:
Content-Length: 0
<------------->
--- (11 headers 0 lines) ---
Really destroying SIP dialog
'65cb07675eefaaef5f655e8a0be6b2f6@92.63.131.3' Method: OPTIONS
[Sep 19 10:51:05] NOTICE[28232]: chan_sip.c:11588 sip_reregister: --
Re-registration for xxx...@sipgate.co.uk
REGISTER 12 headers, 0 lines
Reliably Transmitting (no NAT) to 217.10.79.23:5060:
REGISTER sip:sipgate.co.uk SIP/2.0
Via: SIP/2.0/UDP 92.63.131.3:5060;branch=z9hG4bK13b202d7;rport
Max-Forwards: 70
From: <sip:x...@sipgate.co.uk>;tag=as19513575
To: <sip:xx...@sipgate.co.uk>
Call-ID: 3ef8ff1a6ec360626af409b112b860ee@127.0.1.1
CSeq: 182 REGISTER
User-Agent: Asterisk PBX 1.6.2.5-0ubuntu1.4
Authorization: Digest username="xxxxxx", realm="sipgate.co.uk",
algorithm=MD5, uri="sip:sipgate.co.uk",
nonce="523ac9531b1cc7962e07bce6a76683ee24da44d0",
response="c82fac231a41085c275899ad84f73317"
Expires: 120
Contact: <sip:xxxxxx@92.63.131.3>
Content-Length: 0
---
server*CLI>
<--- SIP read from UDP:217.10.79.23:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
92.63.131.3:5060;received=92.63.131.3;branch=z9hG4bK13b202d7;rport=5060
From: <sip:xx...@sipgate.co.uk>;tag=as19513575
To: <sip:xx...@sipgate.co.uk>;tag=c3e497ecaece77a8e244e564b4212178.3e46
Call-ID: 3ef8ff1a6ec360626af409b112b860ee@127.0.1.1
CSeq: 182 REGISTER
Contact: <sip:xxxxxx@92.63.131.3>;expires=120
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
Scheduling destruction of SIP dialog
'3ef8ff1a6ec360626af409b112b860ee@127.0.1.1' in 32000 ms (Method:
REGISTER)
[Sep 19 10:51:05] NOTICE[28232]: chan_sip.c:18301
handle_response_register: Outbound Registration: Expiry for sipgate.co.uk
is 120 sec (Scheduling reregistration in 105 s)
Reliably Transmitting (no NAT) to 217.10.79.23:5060:
OPTIONS sip:sipgate.co.uk SIP/2.0
Via: SIP/2.0/UDP 92.63.131.3:5060;branch=z9hG4bK2d73294a;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@92.63.131.3>;tag=as5afd24b2
To: <sip:sipgate.co.uk>
Contact: <sip:asterisk@92.63.131.3>
Call-ID: 1becd4dc336869c4692fc4e55e109562@92.63.131.3
CSeq: 102 OPTIONS
User-Agent: Asterisk PBX 1.6.2.5-0ubuntu1.4
Date: Thu, 19 Sep 2013 09:51:27 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Content-Length: 0
---
server*CLI>
<--- SIP read from UDP:217.10.79.23:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 92.63.131.3:5060;branch=z9hG4bK2d73294a;rport=5060
From: "asterisk" <sip:asterisk@92.63.131.3>;tag=as5afd24b2
To: <sip:sipgate.co.uk>;tag=99199803810c7e807ea44745826d9aa4.c753
Call-ID: 1becd4dc336869c4692fc4e55e109562@92.63.131.3
CSeq: 102 OPTIONS
Accept: */*
Accept-Encoding:
Accept-Language: en
Supported:
Content-Length: 0
<------------->
--- (11 headers 0 lines) ---
Really destroying SIP dialog
'1becd4dc336869c4692fc4e55e109562@92.63.131.3' Method: OPTIONS
--
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