Hi Peter!

Not every SIP proxy can deal with clients behind a firewall/NAT box. Therefore it is useful to us an outbound proxy which is known to be capable of NATed clients. This proxy will send keep alive messages to your client to keep the pinhole in your firewall open and rewrites the IP addresses in the SIP messages of the client behind the FW (or NAT box).

yes. ser can be an outbound proxy. every proxy can be a outbound proxy. An outbound proxy is not a special proxy type. Outbound proxy just means that the SIP UA client always sends the SIP messages to this proxy instead of contacting the other participant directly.

regards, klaus

-----Original Message----- From: Peter Hudec [mailto:phudec@postel.sk] Sent: Saturday, November 01, 2003 12:21 AM To: serusers@lists.iptel.org Subject: [Serusers] Outbound proxy

hello,

this is maybe a bit silly question, but.

Outbound proxy is needed, when UA is behind FW. What is the function of this proxy (how can this help the UA to make calls) and what kind of software can do this.

Can SER be also outbound proxy, or I have to use something else ?

hudecof

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