Shaun Tierney wrote:
From what I've been reading about the callprogress option, it seems like itwill work properly only with a T1 or PRI in the US. Is that correct or are there still issues with call progress detection even if those qualifications are met?
If you ask me it doesnt' work well nomatter what kind of line you have.
VoIP (IAX/SIP/H323), PRI, and T-1/E-1 do not need callprogress. The telco provides everything required for progress detection. Analog ports don't (usually) provide this and so callprogress is needed.
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