[asterisk-users] Elementary question - accessing feature codes fromcell phone

[Zeeshan Zakaria]

DTMF sent from cell phones are usually not well recognized at the asterisk
end. The main reason for this is that cell phones transmit out-of-band DTMF,
which by the time reaches an asterisk server traveling through cell towers,
their equipment, various VoIP carriers etc. is usually drifted away from its
acceptable frequency threshhold. Or if a carrier is converting it into
inband, it might not be right at this carrier's end, meaningful it'll have
no tone at all.

Receiving out-of-band DTMF over physical lines like T1s is usually much more
reliable than SIP, because the expensive equipment at big telcos is better
at fixing up bad tones and send you the correct tones.

Zeeshan A Zakaria

--
www.ilovetovoip.com
www.pbxforall.com

On 2010-11-05 11:24 AM, "Danny Nicholas" <danny at debsinc.com> wrote:

  ------------------------------

*From:* asterisk-users-bounces at lists.digium.com [mailto:
asterisk-users-bounces at lists.digium.com] *On Behalf Of *John Regal
*Sent:* Friday, November 05, 2010 10:11 AM
*To:* asterisk-users at lists.digium.com
*Subject:* [asterisk-users] Elementary question - accessing feature codes
fromcell phone





Hi, please forgive me for this (hopefully) simple question. I cannot seem to
find an answer or ...

Hope this answer is more helpful than harmful, but in my experience and
reading, feature codes and cell phones don’t play well together.  DTMF
processing is usually way less than 100% reliable in this setup.  Your best
bet is probably to replicate the feature function you want into an extension
(1234 instead of *72) and dialing that from your cell or using the web
interface on your cell to do the ARI function.



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