В настройках астериска поставил  
allowguest=yes
Результат такой же :-(
Вот лог киски:
----May 28 11:03:31.762: Received:
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.51.14:5060;received=192.168.51.14;rport=54362
From: <sip:192.168.51.14>;tag=590C366-EE1
To: <sip:551@192.168.51.13>
Call-ID: 2F22D5A-46011E5-BCAC97EE-60ED9EEB@192.168.51.14
CSeq: 101 INVITE
Server: Asterisk PBX 1.8.32.2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:551@192.168.51.13:5060>
Content-Length: 0

May 28 11:03:31.766: Received:
SIP/2.0 603 Declined
Via: SIP/2.0/UDP 192.168.51.14:5060;received=192.168.51.14;rport=54362
From: <sip:192.168.51.14>;tag=590C366-EE1
To: <sip:551@192.168.51.13>;tag=as36de75c4
Call-ID: 2F22D5A-46011E5-BCAC97EE-60ED9EEB@192.168.51.14
CSeq: 101 INVITE
Server: Asterisk PBX 1.8.32.2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Content-Length: 0

May 28 11:03:31.774: //145/02F0F3D9BCA9/CCAPI/cc_api_call_disconnect_done: cause=21,retry=0,vcCauseCode=0
May 28 11:03:31.774: //145/xxxxxxxxxxxx/CCAPI/cc_get_call_entry: callID (0x91) not found
May 28 11:03:31.778: Sent:
ACK sip:551@192.168.51.13:5060 SIP/2.0
Via: SIP/2.0/UDP  192.168.51.14:5060
From: <sip:192.168.51.14>;tag=590C366-EE1
To: <sip:551@192.168.51.13>;tag=as36de75c4
Date: Thu, 28 May 2015 11:03:31 GMT
Call-ID: 2F22D5A-46011E5-BCAC97EE-60ED9EEB@192.168.51.14
Max-Forwards: 6
Content-Length: 0
CSeq: 101 ACK
--------

При том, что ошибка уже 603
(SIP/2.0 603 Decline - вызываемый пользователь не желает принимать входящие вызовы, не указывая причину отказа)
Вот  блин!