UA

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... proxy 2. Proxy 2 forwards the call to the called party, UA 2. As part of this call flow ...

... . | | . . | | . . | | . . | | . . | UA 1 | . . | UA 2 | . . | | . . | | . ...

... . | | . . | | . . | UA 1 | . . | UA 2 | . . | | . . | | . . +-------+ . . +-------+ . ...

... transaction. For example, after proxy 2 forwards the request to UA 2, proxy 1 fails. UA ...

... UA 2, proxy 1 fails. UA 2 sends its response to proxy 2, which tries to forward it to proxy ...