Here is a guide to setup a SIP Trunk in GOautodial, with your VoIP account you will have unlimited ports available, this will give you the ability to make multiple concurrent outbound calls at the same time without congestion.Dialplan Entry:
US:
exten => _91XXXXXXXXXX,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _91XXXXXXXXXX,2,Dial(SIP/${EXTEN:1}@switch2voip,,tTo)
exten => _91XXXXXXXXXX,3,Hangup
UK:
exten => _944.,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _944.,2,Dial(SIP/${EXTEN:1}@switch2voip,,tTo)
exten => _944.,3,Hangup
Australia:
exten => _961.,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _961.,2,Dial(SIP/${EXTEN:1}@switch2voip,,tTo)
exten => _961.,3,Hangup
Universal Dialplan:
exten => _847.,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _847.,2,Dial(SIP/${EXTEN:3}@switch2voip,,tTo)
exten => _847.,3,Hangup