02-biancu-routing_basics.pdf

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SIP Tutorial

OpenSER Admin Course

Basic VoIP routing

Voice System SRL

http://www.voice-system.ro

http://www.openser.org

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Overview

 routing logic is totally different if the it is about an initial or

sequential request as there are different routing mechanism

 initial requests

 routing is based on discovery mechanism in order to locate the

destination

 initial request does not only discovery, but also records the relevant

hops on the path from source to destination

 sequential requests

 they are strictly routed based on the information collected by the

initial requests

 who do distinguish the type of the requests?

initial request do not have TAG parameter in To header

© Voice System SRL - OpenSER Admin Course 2

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Initial requests routing...

 identify if the initial request is allowed to be processed on the

server (depending on the service type)

Ex:

residential services – is the caller or callee a local subscriber?

 depending if we do caller or callee based processing, apply

corresponding routing mechanism like:

 enum

 aliases

 dns

 user location

 whatever else transformation

© Voice System SRL - OpenSER Admin Course 3

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....Initial requests routing....

 for the initial requests different routing logics may be applied,

depending of the method. For different methods, different

services and routing mechanism make sense.

Ex: MESSAGE versus SUBSCRIBE versus INVITE

 not all initial requests open dialogs, so if they not in all cases

make sense to record our server to be passed by the sequential

requests.

Ex: MESSAGE requests are stand alone.

© Voice System SRL - OpenSER Admin Course 4

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....Initial requests routing

 if I need to be on the path of sequential requests, record the

server address as hop – record_routing()

Why ? :

 accounting purposes

 dialog monitoring

 routing though firewalls

 network changing

 protocol changing

 security reasons

© Voice System SRL - OpenSER Admin Course 5

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Plik z chomika:

Inne pliki z tego folderu:

01-biancu-configuration_basics.pdf (305 KB)
00-agenda.odp (36 KB)
00-agenda.pdf (93 KB)
01-biancu-configuration_basics.odt (52 KB)
03-dmierla-acl-sip-peering.pdf (333 KB)

Inne foldery tego chomika:

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