Re: [Kamailio-Users] Newbie questions

On 12/28/2009 01:50 PM, Antonio Goméz Soto wrote: No. It is not an endpoint. No. It is not an endpoint. No, it is not an endpoint, although it can trigger external media proxy processes via APIs / control sockets (mediaproxy, rtpproxy) that can perform this functionality. No. OpenSER does not inherently support or not support a header; it has nothing to do with them except to pass them along in a request. It can attach them, and it can read their values if they are present and act on them in some user-defined way; this is true of any such header. OpenSER cannot augment, extend or implement any of the PBX-like features you're looking for; that is simply not what it does. SIP messages enter OpenSER and they leave it, the effect of which is to intervene in and direct the establishment of calls to various destinations. It is fundamentally a network element inside a VoIP service delivery platform, not an application server, PBX, feature server, or other type of call endpoint. It's a rather low-level piece of infrastructure. I think you may have misunderstood what it is people mean when they say that they use OpenSER to help horizontally scale their use of Asterisk out. The role is a complementary one, not a substitute. For example, a typical design for application or service delivery using Asterisk + OpenSER involves multiple Asterisk servers that behave identically when they receive an inbound call, regardless of which server the call came into. This is typically done using some sort of database that keeps shared state, and most likely a central point of logic deployment, such as a FastAGI controller. In this type of situation, as an example, an OpenSER-based load balancer in front of this farm of servers to round-robin among them or do other intelligent call distribution can be used to great effect. But Asterisk (or whatever backend) must still provide the fundamental functionality. Think of Kamailio the same way you would think of a Layer 3 IP router. What you are proposing is analogous to saying that a router can be used to scale an HTTP web server / web site operation. A router cannot inherently do that, but it can assist in doing so as an element of a web server and network topology that makes that possible. -- Alex -- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671