[Asterisk-Dev] PRI receive and answer supervision

Paul Cadach paul at odt.east.telecom.kz
Sun Jun 12 20:16:18 MST 2005


Peter Svensson wrote:
> On Sun, 12 Jun 2005, Paul Cadach wrote:
> > Telco (always) provide early media when audio bearer service/progress
> > indicators is negotiated. At least for EuroISDN.
> An interesting detail is that the EuroISDN spec (EN 300 403-1) states in
> annex K.2 that "Networks which choose to implement these procedures shall
> ensure that they are not used on incoming international calls."
> This refers to actually opening the reverse audio path from the
> B-subscriber to the A-subscriber.

To be correct, from B-subscriber's telco to the A-subscriber. I.e. you (usually) cannot pass reverse auto in
pre-answering stage from CPE :(


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