Line Tone but not able to communicate

[techpc]

Extensions on UAi 16 card have tones but all extensions we cannot hear/communicate when receiving and sending calls.I have swapped the phone equipments on various extension and the phones are working ok.Someone suggested that the voice chip on the card might have blown.Please help

[tot3nkopf]

Can you make calls and hear between two extensions on the UAI card?

[techpc]

Yes,between the two extensions I can make calls and hear on the UAI card

[vad]

If first user can call second user (on the same UAI board) and hear - you have no problem with voice chip.
May be you have no conversation during external calls (VoIP, SIP)?

[techpc]

There is no conversation on both internal and external calls.Its PSTN-ISDN(PRA)

[tot3nkopf]

Can you use another slot in the MG for teh UAI16?

[vad]

1 - Yes,between the two extensions I can make calls and hear on the UAI card
2 - There is no conversation on both internal and external calls.Its PSTN-ISDN(PRA)

Not clear - hear (1) or not (2)?
I think - 2. I hope you have another UAI board - replace two board. You will understand - you have problem with place (slot) or board.
And I hope - you not use slot 5, 6, 7, 8 for UAI16.

[techpc]

Thanks for your replies.I finally got the lines working by synchronizing the System.

[cavagnaro]

What do you mean?

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[haroun]

not clear one time you said internal calls are ok "Yes,between the two extensions I can make calls and hear on the UAI card"
and othe rtime you said no "There is no conversation on both internal and external calls.Its PSTN-ISDN(PRA)"

ithink you have missexplained your issue
when on external communication there is no audio between uai users and external parts through isdn, right ?
and it's Common HW wich can't run on 255 synch mode and should be synchronised :external clock and by domain synch mode )