[asterisk-users] SIP proxy/registration for *

[John]

Dear List:

Please correct me if I am wrong, but as I understand the requirement to
connect an IP-PBX to the PSTN via a SIP trunking service provider (ITSP), a
SIP proxy service and a SIP registration service are required local to the
IP-PBX.    Does Asterisk include this functionality and/or are there other
open source projects providing these SIP services?

Thanks a bunch!

John
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