Something new to me. Recently installed a 1.4.30 box for a small office with four POTS lines in a hunt (Digium TDM410P). Had the telco put a "call forward" option on the main line of the hunt. They dial a feature code from their desk phones (Polycom IP450) that results in forwarding the main number to our VoIP service. This is all to let them "try out" our dialtone service before porting the number to us and ditching the POTS lines. So we perform some test calls and they all go through fine, and everyone is happy, BUT everytime a call comes through it ALSO causes the POTS line to ring, and a "ghost" call rings all the phones in the office (the desired result of an inbound call from POTS). When they answer it they get fast busy because it isn't actually a real call. I spoke to the telco this morning about it and they said "oh yeah - that is a "ring splash" that lets the customer know that a call was forwarded". They said this was a feature of their DMS-100, it has worked that way for twenty years, and they can't turn it off. So to the question - can the TDM410P somehow tell the difference between a "ring splash" and an actual inbound call? I think in the meantime I will send inbound POTS calls to an auto attendant that will eventually hang up, but would love a more elegant solution ;) Cheers, j
On 05/26/2010 11:36 AM, Jeff LaCoursiere wrote:> So to the question - can the TDM410P somehow tell the difference between a > "ring splash" and an actual inbound call? I think in the meantime I will > send inbound POTS calls to an auto attendant that will eventually hang up, > but would love a more elegant solution ;)The simple answer is no; the ling rings, the ringing is detected and forwarded up the software stack. The more complex answer is that first, the TDM410P doesn't actually know anything about detecting ringing, ring patterns, or anything of the like, it's essentially dumb hardware :-) The driver for the hardware detects the incoming ring voltage and debounces it before reporting it to the DAHDI core and then upstream to Asterisk; it is possible you could set the debounce timer to require that the ring last at least 500ms (or maybe even a full second) before reporting it, which would absorb these ring splashes. -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA skype: kpfleming | jabber: kfleming at digium.com Check us out at www.digium.com & www.asterisk.org
The ring splash is a long standing feature of call forwarding.
Of course somewhere in the Asterisk code a change could be made to extend
the time required to detect a valid ring.
But, how about just unplugging the pots lines from the PBX with a quick
restore ability? Unplug lines at the NID, or open bridging clips or
whatever applies.
Cary Fitch
-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jeff
LaCoursiere
Sent: Wednesday, May 26, 2010 11:36 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] "ring splash"
Something new to me. Recently installed a 1.4.30 box for a small office
with four POTS lines in a hunt (Digium TDM410P). Had the telco put a
"call forward" option on the main line of the hunt. They dial a
feature
code from their desk phones (Polycom IP450) that results in forwarding the
main number to our VoIP service. This is all to let them "try out"
our
dialtone service before porting the number to us and ditching the POTS
lines.
So we perform some test calls and they all go through fine, and everyone
is happy, BUT everytime a call comes through it ALSO causes the POTS line
to ring, and a "ghost" call rings all the phones in the office (the
desired result of an inbound call from POTS). When they answer it they
get fast busy because it isn't actually a real call.
I spoke to the telco this morning about it and they said "oh yeah - that
is a "ring splash" that lets the customer know that a call was
forwarded".
They said this was a feature of their DMS-100, it has worked that way for
twenty years, and they can't turn it off.
So to the question - can the TDM410P somehow tell the difference between a
"ring splash" and an actual inbound call? I think in the meantime I
will
send inbound POTS calls to an auto attendant that will eventually hang up,
but would love a more elegant solution ;)
Cheers,
j
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Just set the POTS lines to answer after a second ring rather than after the first. Problem solved. On 5/26/2010 11:36 AM, Jeff LaCoursiere wrote:> Something new to me. Recently installed a 1.4.30 box for a small office > with four POTS lines in a hunt (Digium TDM410P). Had the telco put a > "call forward" option on the main line of the hunt. They dial a feature > code from their desk phones (Polycom IP450) that results in forwarding the > main number to our VoIP service. This is all to let them "try out" our > dialtone service before porting the number to us and ditching the POTS > lines. > > So we perform some test calls and they all go through fine, and everyone > is happy, BUT everytime a call comes through it ALSO causes the POTS line > to ring, and a "ghost" call rings all the phones in the office (the > desired result of an inbound call from POTS). When they answer it they > get fast busy because it isn't actually a real call. > > I spoke to the telco this morning about it and they said "oh yeah - that > is a "ring splash" that lets the customer know that a call was forwarded". > They said this was a feature of their DMS-100, it has worked that way for > twenty years, and they can't turn it off. > > So to the question - can the TDM410P somehow tell the difference between a > "ring splash" and an actual inbound call? I think in the meantime I will > send inbound POTS calls to an auto attendant that will eventually hang up, > but would love a more elegant solution ;) > > Cheers, > > j > >-- Brent Davidson Texas Country Title Company 112 W 2nd / P.O. Box 663 Cameron, TX 76520 254-605-0140 ex. 21 brent at texascountrytitle.com