I am testing 2 ata 188's using SIP. I am experiencing a situation where after 20 seconds the called phone hangs up. It appears to be a problem with the final ack during call setup.Shoud the final ack in this call setup be sent from ata1 directly ...

I am trying to upgrade a 2.15 version of software running MGCP to run 2.15 sip with the ata186us.exe. My understanding is the zup file for 2.15 sip is ata18x-v2-15-020927a-2.zup.So I type the following command on my pc:ata186us -h172.16.3.26 -d1 -a...