very rarely a silent for ISDN calls. Avaya G450

[okulbi]

My users started concerning that sometimes there are silent between customers through ISDN. Please let me know what should I check and which log could help me understand the root cause

[aa1]

Questions and suggestions

There are several places that the problem could be caused by. The phone, the network, the gateway, lack of resources, service provider etc...

- what is the version of Avaya Aura communication manager?
- what is the version of the G450 firmware?
- what sort of phones do you have?
- do all the users experience the problem?
- do the users who experience, experience at the same time?
- how many G450 gateways do you have?
- how many active calls do you have at a time when the problem occures?
- how many ISDN trunks?
- do you use direct IP?
- do you also have remote (branch) gateways?
- since when the problem started?
- was there any changes done to the network, switches, gateway, communication manager?
- what is the far end of the ISDN trunk? Another Avaya server? or 3rd party equipment, or service provider?

I hope these questions can assist/
as for troubleshooting, I would suggest first check the resources and events in the communication manager to see if I have resource issues. then check the gateway firmware to see if it's the latest and matches the communication manager version. check if the communication manager has the latest patch...

Arbi