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The Via Header transparency is achieved by combining Replace Host On Via Header and VIA Header Transparency. Via Header is configurable on either the Embedded Routing Engine (ERE) or centralized PSX. The
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The
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Enabling VIA Header Transparency, whereby all the Via headers received in original INVITE or REGISTER are passed transparently.
Example:Incoming REQUEST (INVITE or REGISTER)
Outgoing REQUEST (INVITE or REGISTER)
Via: 1.2.3.4:9000;branch=xyz
Via: 1.2.3.4:5060;branch=gkSBC5200createdbranchid
Via: 5.6.7.8:10000;branch=abcxyz
Span
Enabling Replace Host, whereby the IP address of the top-most header on the outgoing request with IP address /hostname present in the top most header received is replaced.
Example:Incoming REQUEST (INVITE or REGISTER)
Outgoing REQUEST (INVITE or REGISTER)
Via: 1.2.3.4:9000;branch=xyz
Via: 10.7.1.3:5060;branch=gkSBC5200createdbranchid
Via: 1.2.3.4:9000;branch=xyz
Via: 5.6.7.8:9000;branch=xyz
Via: 5.6.7.8:9000;branch=xyz
Span
The top-most via header's host portion replaces the top most via header on the outgoing request if transparency and Replace host on Via are enabled. The rest of the via headers if any will be transparently passed through in the request.
Example:Incoming REQUEST (INVITE or REGISTER)
Outgoing REQUEST (INVITE or REGISTER)
Via: 1.2.3.4:9000;branch=xyz
Via: 1.2.3.4:5060;branch=gkSBC5200createdbranchid
Via: 5.6.7.8:9000;branch=xyz
Via: 5.6.7.8:9000;branch=xyz
Span
- The top-most Via header has the local SIP port number while receiving the responses.
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