July 2016
Intermediate to advanced
300 pages
6h 49m
English
Content preview from Mastering FreeSWITCHBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Correlating A-leg and B-leg
As we have seen many times in this book, because FreeSWITCH is a B2BUA (Back to Back User Agent), when a user makes a call via FS, FS actually originates a completely independent new call (to callee), and bridges the two calls' audio streams. The streams then flow from caller to FreeSWITCH to callee (and back). In this context, the first call (from caller to FS) is named "A-leg", while the second (from FS to callee) is named "B-leg".
From the point of view of the user, what she experiences as a call is what for us VoIP geeks is two calls, or a bridged call, or A-leg and B-leg.
It's obviously very useful to be able to visualize and debug a complete bridged call, made by the two legs. This gives us the complete picture ...
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