I have a grandstream 101 that is calling an extension on Zap/1 of a TDM20B.
The grandstream 101 can call another grandstream 101 at a different extension- that works fine.
The two phones on TDM 20B can call each other.- no problem.When I call the TDM20B Zap/1
from the grandstream phone it rings - I answer and I dont hear any voice.


for the grandstream I have tried allow=all for the codes but made no difference.

Any ideas on what I am missing?

Thanks,

Jerry
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