[asterisk-users] sip proxy

Steve Edwards asterisk.org at sedwards.com
Sat Mar 3 18:14:46 CST 2012

On Sat, 3 Mar 2012, K bharathan wrote:

> how can i put a sip proxy;

Depending on your OS and which proxy you want, it may be as simple as 
'sudo yum -y install opensips'

> how it differs from asterisk pbx;

I think the major distinction is 'who handles the signaling and who 
handles the media.' A SIP proxy usually only handles the signaling. A PBX 
usually handles both. Note that you can combine a SIP proxy and a RTP 
proxy. Then the distinction is based more on the feature set with a PBX 
having more features relating to handsets.

> currently doing some test on asterisk; thru DSL connection the callers 
> can hear only one way;asterisk pbx is behind NAT;

A common NAT problem. Using 'wireshark' to capture packets and analyze 
them may yield some clues. Recent discussions on this list incriminate SIP 
'helpers' in some routers.

> i am in search of a proper VOIP network ;appreciate some clues in this 
> line

Every one of 'them' is different. How big of a system are you designing? 
Astlinux on a Soekris is great for a couple of simultaneous calls. 
Multiple OpenSIPS hosts fronting a farm of Asterisk hosts could probably 
handle a small nation.

Thanks in advance,
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000

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