I’m trying to build a pbx system to work with 2 gsm channels with the following features:
Outgoing calls to nacional landline or internacional landline/mobile via VOIP
Outgoing calls to nacional mobile via GSM
Inbound calls via PSTN, forward to GSM possibility
Outgoing calls to nacional mobile with prefixes xx and xx via PBX GSM
Outgoing calls to internacional landline/mobile via PBX VOIP
Can you give me some advices for what should have better performance and cheaper?
You think that I should use some ready made pbx and gsm module or build my own pbx with asterisk?
Thank you for your help.