[EMAIL PROTECTED] wrote:
Hi All,
The 3pcc RFC 3725 depicts call flows that are best current practices for B2BUAs... In all the Call Flows the signalling initiates from the B2BUA i.e the INVITE is sent from the B2BUA that then puts the 2 UAs into a Call. But in the real life scenario like Call Transfer, the Call originates from an End Point A that then reaches a IP-PBX (B2BUA) that then tranfers the Call to End Point B. Pl. find below the flows equivalent to those given in the RFC 3725 where the Call originates from an End Point.
[snip]
Flow 4 in RFC 3725 sends out an INVITE from the B2BUA without any media line in the Sdp. This flow is not possible for an INVITE that comes from an external enppoint that will always have an SDP with some media line.
It may be improbable, but it isn't impossible.
For instance, suppose A was yet another B2BUA that is itself carrying out flow 4.
I am in the process of coming up with a test Suite for B2BUA. I am assumuing
that a B2BUA that implements Call Transfer functionality will use any one of
the above flows to achieve Call transfer. Am I correct in assuming this.
A B2BUA is a very general concept. There are many uses for them. You cannot infer very much about the behavior of a B2BUA *in general*, so it is nearly impossible to test that one is acting correctly, except that both sides of it adhere to the rules for a UA.
I suggest you abandon any attempt to generically test a B2BUA. Instead, decide on the behavior you require of the kind of B2BUA you are interested in and test that. If you are interested in a B2BUA that acts as a control point in the middle of calls handled by an IP-PBX, then test for that. You will have to figure out the requirements that need testing, because there are no standards for such a beast.
Also in general in any B2BUA call flow, in a real life situation the Call originates from an Endpoint and reaches the B2BUA that then ends & initiates the Call and controls it. Is that correct..?
Not in general. For instance it isn't true for a "click to dial" application. Maybe it is true for the kind of B2BUA you are interested in.
Paul
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