One way call Nokia SIP Client problem

[wuwik]

Hello,
I have small problem with my Nokia SIP client.
I can make a calls to it but when I'm trying to call from my nokia I get messsage "service unavailable".
Below is a log from my 3CX server.

18-lut-2013 11:01:59.245 Leg L:16.1[Unknown:] is terminated: Cause: BYE from PBX
18-lut-2013 11:01:59.195 [CM502001]: Source info: From: <sip:103@mydomain>;tag=ra2kjqdcqthc6fqb9qi6; To: <sip:100@mydomain>
18-lut-2013 11:01:59.195 [CM503013]: Call(C:16): Incoming call rejected, caller is unknown; msg=Ivite-IN Recv Req INVITE from 87.246.223.221:5060 tid=4hm2lk6gl25cv3ls97kk40r Call-ID=aPt9WsgWoIf4d4WANn_1sM2v-MCsRk:
INVITE sip:100@mydomain SIP/2.0
Via: SIP/2.0/UDP 87.246.223.221:5060;branch=z9hG4bK4hm2lk6gl25cv3ls97kk40r;rport=5060
Max-Forwards: 70
Route: <sip:mydomain;lr;transport=UDP>
Contact: <sip:[email protected]:5060;transport=UDP>
To: <sip:100@mydomain>
From: <sip:103@mydomain>;tag=ra2kjqdcqthc6fqb9qi6
Call-ID: aPt9WsgWoIf4d4WANn_1sM2v-MCsRk
CSeq: 14053585 INVITE
Expires: 120
Session-Expires: 1800
Accept-Language: pl
Allow: UPDATE, PRACK, SUBSCRIBE, REFER, NOTIFY, INVITE, ACK, CANCEL, OPTIONS, BYE
Content-Type: application/sdp
Proxy-Authorization: Digest realm="3CXPhoneSystem",nonce="414d535c07328d1685:2d289c8610bf67cf3323dfe32d9c9f3d",algorithm=MD5,username="103",uri="sip:100@mydomain",response="acd0231b620c8869186e3e3748faa488"
Supported: 100rel, timer, sec-agree
User-Agent: S60 RM-609 111.140.0058 (pl)
Privacy: None
Content-Length: 519

v=0
o=103 63529441289951625 63529441289951625 IN IP4 87.246.223.221
s=-
c=IN IP4 87.246.223.221
t=0 0
m=audio 49152 RTP/AVP 100 96 0 8 97 18 98 13
a=sendrecv
a=rtpmap:100 AMR-WB/16000
a=ptime:20
a=maxptime:200
a=fmtp:100 mode-change-neighbor=1
a=rtpmap:96 AMR/8000
a=fmtp:96 mode-set=0,1,2,3,4,5,6,7; mode-change-neighbor=1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:97 iLBC/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:98 telephone-event/8000
a=fmtp:98 0-15
a=rtpmap:13 CN/8000

I found http://www.3cx.com/blog/docs/source-identification-issues/ that it can be source identification issue. Only problem is that I can not find ‘Source identification’ section.
Aby ideas to solve this problem.
Many Thanks,
Wuwik