Hello, My client's VoIP-network is a very simple one with SER. But he has an Ericsson MD Evolution XL PBX and he wish to make PSTN calls using SIP-phone. The MD Evolution is an IP-PBX but it uses a proprietary protocol and is compatible only with H.323 numeric phones... Does anyone knows if this PBX is SIP compatible ? If this PBX doesn't work with SIP, could I use a PSTN-SIP gateway like Asterisk ? Thanks in advance Gwen