VIC2-2E/M Connectivity Help

[Salvo111]

Hi All,

I have a client that has a Public Announcement system installed. We used an E/M card to interconnect the PA system to the voice gateway on site.
Everything was working fine with the below config:

------------------------------------
!
voice-port 0/1/0
auto-cut-through
type 2
signal immediate
cptone ZA
!
dial-peer voice 9999 pots
description PA_System
destination-pattern 9900
no digit-strip
direct-inward-dial
port 0/1/0
forward-digits 0
!
------------------------------------

Here is the wiring guide from the PA System:

http://www.photosite.co.za/uploads/594PA.jpg

I used this pinout configuration:

http://www.photosite.co.za/uploads/741pinout.jpg

from :

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00800942ef.shtml

I used pins 1,8 for signaling and 4,5 for audio.

Problem
-------
After there was a power failure onsite, the E/M port didn't want to send an 'open signal' to the PA sysem anymore, but the call still proceeded and indicated connected.
After configuring the 2nd E/M port and changing the dial-peer to send the call to it, it worked again.

Could there be an issue with the power that's being supplied from the PA system or incorrect wiring between the 2 devices ?

This problem happened on 2 sites at the customer.