I have the MVP130 and it seems incompatible with a Zultys ZIP 4x4 phone when dialing out from the ZIP to the PSTN. The other direction, calling from the PSTN to the ZIP, works fine after changing the packetization time to 20 on the MVP130.

We have a patch for the MVP130 that fixes this problem. For the patch and upgrade instructions please go to our ftp site at:

https://webfiles.multitech.com/MultiVoip/Misc/ngav/130%20x.05/SIP%20Callid%20Parser/