[asterisk-users] Asterisk with E1 interface vs IP PBX

[Alejandro Facultad]

People, I have an Asterisk SIP server and I have to connect my voip 
users to the PSTN via a E1 trunk.

I have two ways to do this:

1) Connect a E1 interface to my Asterisk (is it possible ???) and then 
connect my Asterisk to the PSTN

2) Buy a commercial IP PBX with a E1 interface, generating the SIP users 
again, and connect the IP PBX to the PSTN

What do you recommend to me based on your experience ???

Thank you

Alejandro