96x1 phones not sounding as good as 9600 series phones

[Mjoeuser]

All,

I have a 6.2 install with two G450 gateways. We have 9641 phones that have poor sound quality. We have TDM trunks from two carries as well as SIP trunks. The call quality on the 9641 phones is poor with default 46xx text file. We see phase jitter at a constant 4-5 on the "li trace sta". I then plug in a 9640 phone and it is perfectly clean on the phase jitter and sounds great.

I plugged a 9641 into the LAN port of one of the gateways and still see 4-5 on the phase jitter.

Avaya came out while working with tier 3 & 4. They played extensively with the 46xx file and have improved the sound of the 9641 somewhat. They left with saying "its about the best we can do". (Ironically, i found them searching this site looking for help as well)

If we had to live with these settings I suppose we would. However, we still see the 4-5 phase jitter every 10 seconds on a li trace, whereas the 9640 is always zero's. They said I shouldn’t be alarmed by this.. (Huh??)

I have searched this and other sites looking for answers. I have seen other people with similar problems with 96x1 but have not found a solution. I'm hoping to open some dialog with this community to seek answers to this quandary. Thanks..

Joe

 

[Mjoeuser]

Simreal,

I'm curious to know what type of trunks you are using and if you have echo cans turned on in both the DS1 settings as well as trunk group. We have both TDM as well as Sip trunks and right now, the SIP are much cleaner sounding then the TDM trunks with or without the ECs, but only with the 96x1 phones.

BTW..9600 phones are clear with either trunks. Thanks,

Joe

 

[simreal]

We do not have any SIP trunks yet. All of our external trunks are ISDN/Copper T1's.

We do have echo cancellation turned n for some of them. It varies trunk to trunk. Some are one or the other and some are both in the trunk and the DS1 form.

- Miguel

A very wise and well respected man once told me "Shut Up!".

 

[jimbojimbo]

If you're having volume issues are you recording the call? Are you using G650 cabinets? Depending on your network regions and which DSP resources are used you may have a "known" issue between 650 cabinets where the db level is inherently dropped 6db. Change the loss to custom and make sure loss group 13 to 18 is changed from 6 to 0.

Status your station and verify if you are coming in on a trunk group in one cabinet and the IP Station is using DSP resources in another cabinet. Happens often with 'permanent' connections or with multiple sites/network regions.