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SIP outbound proxy
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Vonage Business SIP Trunking
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SIP Outbound proxy - the way out
From the SIP RFC:
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 ua is manually configured with an outbound proxy, or can learn about one through auto-configuration protocols.
The outbound proxy is a normal SIP proxy. You configure your client, the phone or software, to use the proxy for all SIP sessions, just like when you configure your Web browser to use a Web proxy for all Web transactions. In some cases, the outbound proxy is placed alongside the firewall and is the only way to let SIP traffic pass from the internal network to the Internet.
The outbound proxy used by a UA can be automatically set with DHCP (this applies to SIP devices mostly, not SIP softphones). There are also autodiscovery solutions, but not frequently used.
- http://www.sipoutbound.com : SIP Outbound Proxy Service
- SIP proxy
- SIP redirect server
- RFC 3361: IPv4 Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers
- RFC 3319: IPv6 Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers
- SIPPP.COM Free SIP Outbound Proxy Service
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