[Users] Difference between Alias and Listen

[Klaus Darilion]

"listen" defines the sockets on which openser is listening.

inside openser there are several function which need to know if a 
message is addressed to this openser or not.

eg. INVITE asfas at domain.com

Openser has to know if domain.com is itself and it should process the 
message or if it should forward the request to domain.com.

For the from URI or request URI there the functions from the domain 
module which stores this information in a database.

You can also use the "myself" function. myself and the loose_routing 
function uses the "aliases" to find out if a message is addressed to 
this openser or not.

Thus, openser internally has a list of aliases it is responsible of. 
This list includes:
  - all the IP addresses on which openser is listening
  - all the domain names found out by reverse lookups of the listening IPs
  - all aliases which were defined with the alias= option

regards
klaus



Max Gregorian wrote:
> Hi there,
> 
> Could someone please explain to me the actual difference between 
> */Alias=/* and */Listen=/*. I have read the documentation ( 
> http://www.openser.org/dokuwiki/doku.php?id=openser_core_cookbook#alias 
> and 
> http://www.openser.org/dokuwiki/doku.php?id=openser_core_cookbook#listen 
> <http://www.openser.org/dokuwiki/doku.php?id=openser_core_cookbook#listen>) 
> but still cannot distinguish between what the two functions are doing 
> differently.
> 
> Do I _need_ to use both Alias and Listen at the same time in the config?
> 
> For example, if I have an openser server responsible for multiple 
> domains /sip1.foobar.com <http://sip1.foobar.com> /, /sip2.foobar.com 
> <http://sip2.foobar.com>/, etc and also listening in on multiple ports 
> (/5060/, /5061/, /5062/), would I have to add the following to my 
> openser.cfg?
> 
> listen=udp:localhost:5060     /* Loopback */
> listen=udp:localhost:5061
> listen=udp:localhost:5062
>  
> listen=udp:192.168.1.101:5060 <http://192.168.1.101:5060>  /* LAN IP of 
> the server */
> listen=udp: 192.168.1.101:5061 <http://192.168.1.101:5061>
> listen=udp:192.168.1.101:5062 <http://192.168.1.101:5062>
>  
> listen=udp:sip1.foobar.com:5060 <http://sip1.foobar.com:5060>  /* Domain 
> 1 */
> listen=tcp:sip1.foobar.com:5060 <http://sip1.foobar.com:5060>
> listen=udp:sip1.foobar.com:5061 <http://sip1.foobar.com:5061>
> listen=tcp:sip1.foobar.com:5061 <http://sip1.foobar.com:5061>
> listen=udp:sip1.foobar.com:5062 <http://sip1.foobar.com:5062>
> listen=tcp:sip1.foobar.com:5062 <http://sip1.foobar.com:5062>
>  
> listen=udp:sip2.foobar.com:5060 <http://sip2.foobar.com:5060>  /* Domain 
> 2 */
> listen=tcp:sip2.foobar.com:5060 <http://sip2.foobar.com:5060>
> listen=udp:sip2.foobar.com:5061 <http://sip2.foobar.com:5061>
> listen=tcp: sip2.foobar.com:5061 <http://sip2.foobar.com:5061>
> listen=udp:sip2.foobar.com:5062 <http://sip2.foobar.com:5062>
> listen=tcp:sip2.foobar.com:5062 <http://sip2.foobar.com:5062>
>  
> 
> alias="sip1.foobar.com:5060 <http://sip1.foobar.com:5060>"  /* Aliases 
> for Domain 1 */
> alias="sip1.foobar.com:5061 <http://sip1.foobar.com:5061>"
> alias=" sip1.foobar.com:5062 <http://sip1.foobar.com:5062>"
> 
> alias="sip2.foobar.com:5060 <http://sip2.foobar.com:5060>"  /* Aliases 
> for Domain 2 */
> alias="sip2.foobar.com:5061 <http://sip2.foobar.com:5061>"
> alias=" sip2.foobar.com:5062 <http://sip2.foobar.com:5062>"
> 
> alias="111.222.333.444>"  /* IP OF SERVER */
> 
> Now if I understand correctly then *if (uri==myself) { }* should now be 
> true for each of these domains.
> 
>  
> 
> 
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