SV8500 Outgoing call with COT

[hcmbmt]

I had an issue with Outgoing call using Analog trunk.
1. Loopback LC-COT: ok for both outgoing a& incoming calls
2. FXO -FXS connection with Avaya PABX: ok for both in & outgoing calls
3. Connect to PSTN trunk COT line
- Incoming call is ok
- Lamp of COT port on COT card is always ON. Either in Idle or busy status
- Can't make outgoing call. Dial trunk access code --> deny tone

For all above testing, I use same configuration, same card, same wiring, only change the incoming source for Trunk port.
Please advice me if you have any experience about this.

 

[belevedere]

Is the trunk route data for the analog trunk set to loop or ground start? Does it match the trunk type of the connected trunk??

 

[hcmbmt]

I tested already. Either ground or loop, the same result. However, I found out the problem reason. Just change tip ring of incoming cable or change COT card setting to auto polarity.