As part of a large migration from TDM to IPT we have installed 3 x V224 Analogue Gateways for use with Modems on Laptops etc. to dial up to customer equipment via the PSTN (TDM).
The engineers who are initiating the modem connections are complaining that the negotiated speed is very low and is often dropping the connection or hanging the session.
I have checked both the V224 and VWIC gateways and bot are set to enable Modem Passthrough, not too sure what else I should be checking.
Any assistance on what to check would be much appreciated.
The VWICs, are they MFTs? PRIs? If so, are you
getting your clock form the carrier? Clock slips will cause the type
of behavior you are seeing. Do a show controller....
If you find nothing there, something in the back of my mind is telling me you might want to make sure you also have fax passthrough - that in certain cases that handles modem traffic as well