On 12/14/2009 08:05 PM, Peter P GMX wrote:

We currently use Patton gateways SN4116 for attaching fax and modem equipment to our Freeswitch system. Freeswitch is in bypass-media-mode, so media flow goes the following way: Modem/Fax => Patton_SN4116 => Patton_SN46XX =>PSTN/ISDN However modem connections are not very reliable. We exchanged the SN4118 against a "Fritzbox" ATA and the situation improves. However Fritzboxes do not deliver the number of ports we need.

What is your experience? Which ATA is the best choice for modem connections? Best regards Peter

Your improvement is probably more due to luck than engineering. Turning off any dynamic jitter buffering, and making sure you use only A-law or u-law, will reduce the failures. the only thing that will give reliable results for modems is a managed, absolutely lossless, packet path, and terminal equipment which does doesn't slip data samples to allow for mismatched sampling clocks. Good luck finding those. Steve