Difference between sip proxy and sip outbound proxy

Asked 10/12, 2015 at 6:55 Answered 10/2, 2017 at 15:37

I'm little bit confused about sip proxy and sip outbound proxy? What is the basic difference between sip proxy and sip outbound proxy? Is it mandatory to use sip outbound proxy along with sip proxy? Can anyone point me out from the below image which one is the sip proxy and outbound proxy?

Zootomy answered 10/12, 2015 at 6:55 Comment(0)

As your attached picture, it should be:

User Agent: Client
SIP outbound proxies: SIP Proxy port 5060 & SIP Proxy port 5070 when they're receiving incoming request from UA

A sip proxy can be understood as an "outbound proxy" or an "inbound proxy". Details explanation can be describe as below:

"Pretend you are a SIP User Agent, perhaps a very simple UA that doesn't even do DNS lookups.

A call coming to you is "inbound".

It may hit your home proxy first, and receive treatment such as being proxied to you based on your registered contact. This is an "inbound service", and your home proxy is acting as an "inbound proxy".

Now you want to make a call. Since you're making the call, it is going "out", or can be called "outbound". You send this call to a proxy, which looks up the request URI in DNS and sends the call on towards its destination. This proxy is providing the "outbound service" of DNS resolution, and is acting as an "outbound proxy" for this call.

On any call there may be any number of inbound and outbound proxies and services. Some proxies may even provide both sorts for a single call.

Assume the simple network UA1----P1----P2----UA2

UA1 places a call to UA2."

//refer: https://www.ietf.org/mail-archive/web/sip/current/msg06276.html

Claudineclaudio answered 10/2, 2017 at 15:37 Comment(0)

SIP Proxy

A SIP proxy server receives a SIP request from a user agent or another proxy and acts on behalf of the user agent in forwarding or responding to the request.

Sip Outbound Proxy

An outbound Proxy: A proxy that receives requests from a client, even though it may not be the server resolved by the Request-URI. Typically, a SIP user agent is manually configured with an outbound proxy, or can learn about one through auto-configuration protocols.

Basically they are the same, the only difference, is that SIP Proxy treats requests both for UAC (client) and UAS (server), but SIP Outbound Proxy receives requests from UAC. And, no, it's not mandatory to use SIP Outbound Proxy along with SIP Proxy. What about scheme from your image, these are not proxy servers, but are registrar servers which are used to register requests of the users and keep the information from these requests.

Binion answered 10/12, 2015 at 8:40 Comment(3)

So, for sip registration which registrar server should I use? – Zootomy 11/12, 2015 at 6:28

do you own register server or have a sip account ? – Binion 11/12, 2015 at 7:59

I own a register server. – Zootomy 11/12, 2015 at 12:27

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