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[asterisk-users] Dispatching calls question


 
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geisj at pagestation.com
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PostPosted: Wed Aug 20, 2014 3:53 pm    Post subject: [asterisk-users] Dispatching calls question Reply with quote

I have a question about dispatching calls...

If I try to dispatch a call on line 1 using the AMI
and I check in my table to see if line 1 is available and it is....
So I have done my checking now I dispatch my call 
and at that same time a call comes in on line 1 and now its no longer available 
for me to make a call, I connect on AMI and my call fails....


How do I prevent this from happening? Sure I can start at 23 instead of 1 and work down
instead of up  but eventually the same thing may happen.


I'm using Asterisk 11.11 if that matters.


Thanks,



Jerry
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asterisk.org at sedwar...
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PostPosted: Wed Aug 20, 2014 4:01 pm    Post subject: [asterisk-users] Dispatching calls question Reply with quote

On Wed, 20 Aug 2014, Jerry Geis wrote:

Quote:
I have a question about dispatching calls...
If I try to dispatch a call on line 1 using the AMI
and I check in my table to see if line 1 is available and it is....
So I have done my checking now I dispatch my call 
and at that same time a call comes in on line 1 and now its no longer available 
for me to make a call, I connect on AMI and my call fails....

How do I prevent this from happening? Sure I can start at 23 instead of 1 and work down
instead of up  but eventually the same thing may happen.

If you're using something like MySQL, use 'get_lock/release_lock.'

If you're using some other database, see what locking features you have
available.

--
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
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EWieling at nyigc.com
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PostPosted: Wed Aug 20, 2014 5:33 pm    Post subject: [asterisk-users] Dispatching calls question Reply with quote

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Steve Edwards
Sent: Wednesday, August 20, 2014 9:01 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Dispatching calls question

Quote:
On Wed, 20 Aug 2014, Jerry Geis wrote:

Quote:
I have a question about dispatching calls...
If I try to dispatch a call on line 1 using the AMI
and I check in my table to see if line 1 is available and it is....
So I have done my checking now I dispatch my call 
and at that same time a call comes in on line 1 and now its no longer available 
for me to make a call, I connect on AMI and my call fails....

How do I prevent this from happening? Sure I can start at 23 instead of 1 and work down
instead of up  but eventually the same thing may happen.

If you're using something like MySQL, use 'get_lock/release_lock.'

If you're using some other database, see what locking features you have
available.

Asterisk 1.8 and later have lock functions available in the dialplan. This might be better if you have a single Asterisk server.

pbx*CLI> core show functions like LOCK
Matching Custom Functions:
--------------------------------------------------------------------------------
LOCK LOCK(lockname) Attempt to obtain a named mutex.
TRYLOCK TRYLOCK(lockname) Attempt to obtain a named mutex.
UNLOCK UNLOCK(lockname) Unlocks a named mutex.
3 matching custom functions installed.


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