Hello All, I recenlty installed ser stable version (0.8.14) and I use it with a couple of Cisco IP Phones and a Cisco 36xx voice Gateway. I installed it using mediaproxy because some phones are behind a nat and it works fine for "basic calls" (IP-IP, IP-PSTN and PSTN-IP). However I have a problem when I try to transfer (using attended transfer) a call coming from PSTN to a phone that is behind nat. The problem is the following: The phone originating the transfer sends correctly the REFER method to the Voice gateway through SER server containing the refer-to: number@publicIPaddress but the Gateway sends the INVITE method "directly to the publicIPaddress of the NAT", and doesn't pass through the SIP server (that "manages" the messages for the NATed phones) even if I configured a dial peer voip matching the voip strings and specifying the server where I have to send the INVITE requests. My question is: is there any way to configure SER changing the REFER message in order to "force" the gateway to send the INVITEs through the server? Or, anyone knows if something more than dial-peers has to be configured on Cisco gateways? Thanks a lot in advance, Raffaele.