is this the typical Asterisk topology?


On my home system, I have the Asterisk server, tleilax, and the client, doge, connecting into my router -- so that they're both on the same network. The IP addresses are:



doge 192.168.1.x (usually 3)

Based on the above image, I don't quite understand what the topology should look like. What if you have multiple clients? They can't all connect to tleilax unless you put in a ton of NIC's!

Here you see multiple clients connected to an Asterisk box:

hard phones

but no mention of a switch...

Pardon, if it's in the definitive guide, I missed it. (I have the 4th ed.)

This diagram:

sip trapezoid

well useful, doesn't help me to understand the network topology of a simple setup, but with multiple clients..

  • I'm considering a simple switch so that doge and other pc's can connect to tleilax...but I suppose tleilax will need another NIC, too? – Thufir Feb 21 '15 at 6:22

These images show logical topology not physical one.

Image 1

It does not mean you have to get many NICs if you want many client. The line symbolizes LAN there. So in fact your physical topology will include a switch, to which all the clients, and the asterisk box would be connected.

Image 2

This show the basic mode of operation. SIP protocol is used only for signalling. Voice is transmitted by RTP protocol directly between the clients (or in some scenarios through an asterisk, which helps in NAT traversal).

The image below shows a typical SIP flow, you can see SIP protocol in action but when the session is established, media channel (RTP) goes directly between the clients.

enter image description here

Image 3 ##

This is basically the same as Image 2 but instead of 1 proxy, here every client has its own SIP proxy. This is a typical situation where each of the users is in a different VoIP provider.

Summing up

If you want a simple topology with a SIP Registry server and Proxy, then you can have one Asterisk, switch and computers in one LAN.

PS: Mind that the most basic SIP topology is with clients alone, which can communicate to each other directly with SIP. No proxy, no registry needed.

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