Callback doesn't work in FPBX-2.10.0beta3

Beta Program Issues
1 
Hello

This is a clean install of FPBX-2.10.0beta3
Callback doesn’t work at all - incoming call rejected, no outgoing call placed:

-- Goto (callback,1,1) -- Executing [1@callback:1] Set("SIP/Multifon-0000005e", "CALL=44") in new stack -- Executing [1@callback:2] Set("SIP/Multifon-0000005e", "DESTINATION=ivr-2.s.1") in new stack -- Executing [1@callback:3] Set("SIP/Multifon-0000005e", "SLEEP=3") in new stack -- Executing [1@callback:4] System("SIP/Multifon-0000005e", "/var/lib/asterisk/bin/callback 44 ivr-2.s.1 3 &") in new stack -- Executing [1@callback:5] Hangup("SIP/Multifon-0000005e", "") in new stack == Spawn extension (callback, 1, 5) exited non-zero on 'SIP/Multifon-0000005e'
2

Someone created a ticked on this, so I updated it with my findings:
http://www.freepbx.org/trac/ticket/5492

3

Having the same problem. Any updates on this?

Running Asterisk 1.8.8.0
PBX Firmware: 1.0.0.0
PBX Service Pack: 1.88.210.57-1

10.0rc1.0

Backup & Restore 2.10.0.6 Enabled
Blacklist 2.10.0.0 Enabled
Bulk Phone Restart 2.10.0.1 Enabled
CallerID Lookup 2.10.0.0 Enabled
Custom Applications 2.10.0.0 Enabled
DUNDi Lookup Registry 2.10.0.0 Enabled
Feature Code Admin 2.10.0.1 Enabled
FreePBX ARI Framework 2.10.0rc1.0 Enabled
FreePBX FOP Framework 2.10.0.2 Enabled
PBX Framework 2.10.0rc1.0 Enabled
Java SSH 2.10.0.0 Enabled
Online Support 2.10.0.1 Enabled
Phonebook 2.10.0.0 Enabled
Phonebook Directory 2.10.0.0 Enabled
Recordings 3.3.11.4 Enabled
System Admin 2.10.0.20 Enabled
User Panel 2.10.0.0 Enabled