wan connections for phones (pstn)

[carl_townshend]

Hi all, I dont know if anyone can help me on here, if I wanted 30 lines for phones to my building, can I use either an isdn 30, or an e1 connection as the e1 as 30 channels also ?

[EnriqueFornes]

isdn 30 e1 will work.

My question, is there a way to configure a router with a frame relay broadband access and 4 E1's going to a PBX so that, when an incoming call comes from the FR broadband access and all the voice channels in the 4 E1's are in use, the router puts the incoming call in queue until a voice port is free, connecting the first call in queue?