Hello,here is my problem .... I have a sip trunks line (data and voice) from the operator .... sip trunk cable is plugged into trunk port of router (Zyxel) ....I made a filter for the lines....first for data (Internet), second for  voice (VoIP) ... d...

on my network .. i have cisco router 2610xm  and  20 ip phone cisco 7960 . i want to connect them to PSTN .i know that i need E1 interface ... but I want to know the type and the reference of card that will work very well with my router .NB : E1 just...