Rejecting

1. Brekeke Product Name and version: Brekeke PBX, Version 2.2.6.2 , Pro

2. Java version: 1.6.0_11

3. OS type and the version: Windows 2003 5.2

4. UA (phone), gateway or other hardware/software involved: eyeBeam 1.5.19.5 build 52344

5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/ ... terns.html : 9

6. Your problem: would like to return SIP error message 503 to UA when ITSP set at ARS returns 404 or 488.

you can use ars failover
http://www.brekeke-sip.com/download/bpb ... sic_en.pdf
page 34

I did not understand how ARS Failover can perform this...

if ITSP return 404 or 488, the call will be sent to a pbx user with ars failover and the user can play voice message like "service is not available"

i donot know how to send 503 sip response back, generally pbx will send 486 back