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mark at dawebber.com
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 Posted: Wed Apr 16, 2008 8:40 am Post subject: [asterisk-users] Busy (congestion) signal and cell phones |
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Hello, all!
I've noticed a peculiar situation and I am hoping someone can shed
some light on it for me. We have an Asterisk (1.4.18 ) box talking to
the world via Zaptel on a PRI from a telco (USA). I have an extension
that returns busy signal (fast-busy or regular busy) (using US tones).
When I call from a landline or from another PBX, I get a busy signal,
just like I expect. But when I call from a cell phone, the cell phone
terminates the call as soon as connection is established. I've tested
several cell phone models from different providers in the US. Same
thing happens with calls coming from Gizmo.
I manually changed the tones I send back (with Playtones) to mimic
Austrian busy tone (picked the first one in the list from
indications.conf) . Now, from the cell phone and Gizmo alike, I get
busy tones. So, my questions is:
why do cell phones and Gizmo both detect busy tones and terminate the
call? Is that a standard behavior? Why don't landlines do that?
Thank you in advance.
Regards,
Mark G. |
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g.stewart at horwits.c...
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| Posted: Wed Apr 16, 2008 9:33 am Post subject: [asterisk-users] Busy (congestion) signal and cell phones |
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On Wed, 16 Apr 2008 08:40:42 -0500, Mark Gimelfarb <mark at dawebber.com>
wrote:
| Quote: | why do cell phones and Gizmo both detect busy tones and terminate the
call? Is that a standard behavior?
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It *is* standard procedure for a cellphone to terminate a call immediately
it discovers that the called number is busy. It will then, optionally,
initiate its auto-redial function etc.
| Quote: | Why don't landlines do that?
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Because back in the old days there were no intelligent electronics to tell
the user that the call failed. A special "busy" tone had to be generated to
inform the user that they should hang the receiver up manually. Some
traditions die hard.
--
Godwin Stewart - Horwich IT services |
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eric at fnords.org
Guest
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| Posted: Wed Apr 16, 2008 9:35 am Post subject: [asterisk-users] Busy (congestion) signal and cell phones |
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What country are you in?? Yes, it is common for cell phones to
disconnect the call if they receive CONGESTION, but not BUSY.
Horwich IT Services (Godwin Stewart) wrote:
| Quote: | It *is* standard procedure for a cellphone to terminate a call immediately
it discovers that the called number is busy. It will then, optionally,
initiate its auto-redial function etc.
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--
Consulting for Asterisk, Polycom, Sangoma, Digium, Cisco, LAN, WAN, QoS,
T-1, PRI, Frame Relay, Linux, and network design. Based near
Birmingham, AL. Now accepting clients worldwide. |
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