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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?
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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".
When you look at the configuration options on most IP phones, you will see a field called “Outbound Proxy” or “Outbound Proxy Server”. In this field you can enter an IP address, a host. domain name or just a domain name (as long as it can be resolved to an IP address in DNS).
(Session Initiation Protocol proxy) A proxy server that allows SIP-based telephony packets to traverse the network's firewall. The SIP proxy takes over call control and provides address translation in order to direct calls to the appropriate phones within the network.
It ensures a quick response to inbound calls. It can also send a call to a list of phones in sequence and ring each one until it's answered. Using a stateful SIP proxy, you can save all your calls, messages, and files.
As your attached picture, it should be:
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
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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.
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