SIP Trunking; where are we at now? Chasing a myth?

SIP is rapidly becoming the de facto standard protocol for IP telephony. Hang on, did I just answer my opening question? Well not quite, so let me re-phrase that question and see if I can find some insight into the fact that, although SIP is increasingly pervasive, then why is it that ISDN is still the preferred way of connecting our PBX to a carrier?

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