Steven Critchfield wrote:
On Mon, 2004-02-16 at 07:39, Jean-Marc V. Liotier wrote:
When dialing out, will a call be established significantly faster by an
ISDN adapter such as an Eicon Diva server compared to an analogical FXO
such as Digium's X100P ?
Analog, nothing logical there.
ISDN will be faster dialing out as you will communicate with asterisk
via the dialpad where you want to be connected too, and if you are on a
analog line, asterisk will repeat the digits to the telco switch in
analog just like you did but at a specific cadence. Since a DTMF digit
is around 450 to 800 msec, and in that time frame you can transfer all
Eh? A DTMF digit is about 100ms - roughly 50ms on and 50ms off. Your
overall conclusion is right though. Digital is much faster. On a PRI T1
some managers complain they only get 23 channels, while they would get
24 if the used robbed bit lines. However, for lines carrying lots of
short calls the faster call setup on a PRI means it is usually a
significant win overall.
the call setup information digitally, the call could be setup in the
equivalent of a single digits time, let alone the next 6-10 digits.
Incoming, the calls are again signaled digitally and acknowledged with
the switch in less time than it takes to make the first half of a ring.
On analog you will want to wait till the second or third ring to get the
CallerID, but it was there to start with on the ISDN call.
On my PRI line, calls are answered and prompts played without a single
ring event being heard by the caller.
This can be a little confusing for the caller, but thankfully it also
screws up a lot of telemarketer systems. Dialogic et al don't recognise
the phone as properly answered if they never hear the ringback tone :-)
Regards,
Steve
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