ISDN PRI TRUNKS NOISY

[pea123]

Recently installed the above trunks on 3300 but all of them are highly noisey.Connecting the lines straight to an ISDN tester they are fine so this points to ICP Trunks programming.I have retraced my steps over & over & dont seem to see the problem.I have installed PRI many before times.Please assist.

 

[fissure]

Is your country set correctly, under:

System Configuration

System Capacity

License and Option Selection

as I think that determines whether a-law or u-law encoding is used?

u-law normally for US and a-law in Europe

http://en.wikipedia.org/wiki/A-law_algorithm

http://en.wikipedia.org/wiki/Ulaw

Having this wrong once, on an ISDN30/PRI in the UK, I think we got horrible static/noise

 

[pea123]

Had to change VOICE ENCODING under LINK DESCRIPTOR ASSIGNMENT from NIL to ADI & the trunks became clear.Thanks.