[SR-Users] Several Asterisk on this same IP

Alex Balashov abalashov at evaristesys.com
Mon Mar 13 23:05:44 CET 2017

Well, indeed, but a sequential scan of many consecutive ports like this from the bottom of the same range can be quite a latent operation. So at the very least the allocation strategy would benefit from being random. Does Asterisk take that approach? 

On March 13, 2017 6:04:06 PM EDT, Kjeld Flarup <kfc at viptel.dk> wrote:
>No there is no such thing as magic.
>The most obvious way to implement the RTP port handling, is to first 
>open the next UDP port in the OS, and then report that back in the 
>Invite/200Ok. If the port cannot be opened, then simply try the next in
>Med venlig hilsen / Best regards
>Kjeld Flarup (Christensen) M.Sc E.E, Teknisk chef
>Viptel ApS, Hammershusvej 16C, DK-7400 Herning
>Telefon: +45 46949949, Telefax: +45 46949950, http://viptel.dk
>On 03/13/2017 01:52 PM, przeqpiciel wrote:
>> Maybe there is an magic device? I know that if we have an asterisk, 
>> that become to us with default configuration of rtp ports sets to 
>> 10000_20000. And each call choose the one port fron that range. So if
>> we have several asterisks with default configuratiin of rtp, there is
>> possibilities to have 2 concurent calls each through another asterisk
>> instance with this same rtp port. Am i right?
>> So mqybe this magic device could see source IP address and route rtp 
>> to correct adterisk?
>> 13.03.2017 7:15 AM "Alex Balashov" <abalashov at evaristesys.com 
>> <mailto:abalashov at evaristesys.com>> napisaƂ(a):
>>     On Mon, Mar 13, 2017 at 07:08:09AM +0100, Kjeld Flarup wrote:
>>     > We run multiple Asterisk instances since 1.4 and never
>>     configured RTP ports.
>>     >
>>     > More challenging issues are the Asterisk DB, and the Asteisk
>>     You may not have enough calls for RTP port collisions to become
>>     issue. Otherwise, I'm not sure how you're avoiding it, since
>>     isn't aware of which ports from within the range are in use.
>>     --
>>     Alex Balashov | Principal | Evariste Systems LLC
>>     Tel: +1-706-510-6800 <tel:%2B1-706-510-6800> / +1-800-250-5920
>>     <tel:%2B1-800-250-5920> (toll-free)
>>     Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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-- Alex

Principal, Evariste Systems LLC (www.evaristesys.com)

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