Hi, This is VoIP rather than a specific Freeswitch question. I am developing an implementation of some of the V.150 series specifications within the spandsp library, to be able to support modem over IP in open source software like Freeswitch. I am having problems identifying equipment I can test against. There is quite a bit of used VoIP kit around, at E-Bay and similar places. I assume I can find something used from Cisco and others that is not too expensive, for my development testing. My problem is identifying exactly which things offer V.150 support. Looking at the Cisco documentation, they seem to focus far more on the software requirements for the support of specific features, than on the model numbers of hardware with the relevant support. Can anyone help me with this? Regards, Steve