REFER Request problem in attended transfer

1. Brekeke Product Name and Version:
Brekeke PBX, Version 3.5.2.6,
2. Java version:
1.7
3. OS type and the version:
windows 7
4. UA (phone), gateway or other hardware/software involved:

5. Your problem:

I have a problem with REFER method.
I have 2 propietary soft-phones. They communicate with each other without intervention of pbx. I need proxy to communicate with other commercial phones. My soft-phones are correctly registered in sip proxy.

This is the escenario:

314004 (ip: 192.168.1.204) is our soft-phone.
314006 (ip: 192.168.1.206) is our soft-phone.
314033 (ip: 192.168.1.237) is a commercial phone.

PBX is in 192.168.1.4

-314033 call 314006. Throught the PBX.
-314006 parks 314033.
-314006 call 314004. Without the PBX.
-314006 transfer 314033 to 314004.

When 314006 sends REFER to PBX with replaces info in Refer-To header, the PBX send a 403 Forbidden.

This is the REFER:

REFER sip:314033@192.168.1.4:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.206:5060;rport;branch=z9hG4bKPj188c5f8c1bd640e8948258c0a4f00780
Max-Forwards: 19
From: <sip:314006@192.168.1.4>;tag=fe0b2da3c2fd403a8149ddf97bb22b58
To: "314033" <sip:314033@192.168.1.4>;tag=bc8457580p
Contact: <sip:314006@192.168.1.206:5060>
Call-ID: b99cc4f8-8d2563a4-5444fe98-b55116aa
CSeq: 6869 REFER
Event: refer
Expires: 600
Accept: message/sipfrag;version=2.0
Allow-Events: presence, message-summary, refer, conference
Refer-To: <sip:314004@192.168.1.204?Require=replaces&Replaces=29080f1ec4834f7a8bf86a69acdb295c%3Bto-tag%3D1d8244c7c60b40d6b4a43ca2b1f2e8b9%3Bfrom-tag%3Dc7d3c886c1874fc8bb7376b58a2fb828>
Referred-By: <sip:314006@192.168.1.4>
User-Agent: U5K-UA/1.0.0
Content-Length: 0

This is the 403 response:

SIP/2.0 403 Forbidden
Via: SIP/2.0/UDP 192.168.1.206:5060;rport=5060;branch=z9hG4bKPj188c5f8c1bd640e8948258c0a4f00780
From: <sip:314006@192.168.1.4>;tag=fe0b2da3c2fd403a8149ddf97bb22b58
To: "314033" <sip:314033@192.168.1.4>;tag=bc8457580p
Call-ID: b99cc4f8-8d2563a4-5444fe98-b55116aa
CSeq: 6869 REFER
Event: refer
Content-Length: 0

I resolved it sending REFER to de UA is not back to the PBX.

My SIP trunk provider does not allow "Refer" messages on call transfer therefor my day time auto attendant is unable to transfer calls. Is there away to change ths behavior is SIPX?

гадание

Elidway,
Which version of Brekeke PBX are you using?