Input gain/ output attenuation issue with 2620 router

[Phoneguy69]

Have an issue with low volume at a remote site. Customer has a Cisco 2620 Router w/ fxo module.
They have 4 pots lines coming in.
When recieving a call or placing a call via these line the calling party or called party can barely hear our users at the site. I can dial station to staion and everything is fine. I tried manipulating the input gain and Output-attenuation. Default it was set to input-gain=0, output atten.=3

I configured these gains on up as high as input-gain=6, out-atten.=12 and then went the other way into the negatives.
My impedence level is 600

In the process I did add volume, but the snap, crackle, pop static noise was apparent and voice quality
went down. I have put the default values back, but still have the issue with low volume.
Also- when you call the main line to the site, the first ring you hear sounds fine and then there is a drop in the volume on the 2nd ring to where you can barely hear it.

Hopefully someones had this issue- I have called the carrier and they state their lines are fin its my equipment. Any help would be appreciated.

 

[pndscm]

Where are you changing the settings? What type gateway is it, H.323 or MGCP? How far is your system from the serving Telco?

 

[ADB100]

I had the same issue with a dodgy VIC-2FXO module. It transpired the VIC-2FXO was counterfeit. The router recongnised the module but reported an error about the EEPROM on bootup and when the 'show diag' command was issued. I replaced this with a 'real' VIC-2FXO-EU module and the problem has now been resolved.

The fake VIC-2FXO was purchased off eBay for a home lab, the sellers source was apparently China - he did apologise but I never got a refund...... The fake module was an exact replica and still back to back with the original one it looks identical.

HTH

Andy

 

[Phoneguy69]

It is an H323 gateway.
I do suspect that the FXO module is bad, but to truely test it I need a replacement. I had the telco out and their signal is strong- we verified with a test set before the lines go into the router and when they are connected to the router. I have a trouble ticket in with Cisco and awaiting word.