[Asterisk-Dev] Specific question about pri_dchannel in channels/chan_zap.c

Mark Spencer markster at digium.com
Wed Jul 9 06:26:36 MST 2003

In the specific case of zap, you can always count on a channel being read
quite frequently since one of the file descriptors will point to a channel
which (on or off hook) will always return some sort of audio periodically.
on other channels such as "SIP" and "MGCP", we use a pipe to notify (the
pipe is the only way I could figure out to *guarantee* that there was no


On Wed, 9 Jul 2003, Chris Ziomkowski wrote:

> I have a more specific question in my quest to understand the internals of
> asterisk and implement R2 outbound dialing.
> Specifically, given a PRI channel dialing out, it appears that the ANSWER
> message will be read by the function pri_dchannel in channels/chan_zap.c at
> or around line 5806.
> My question is, how does an application (such as Dial) which is blocked in
> an ast_select() on the channel actually get informed of this?
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