[asterisk-users] Asterisk doesn't relay remote MOH during hold

[Kevin P. Fleming]

Richard Brady wrote:

> I have researched the musiconhold / musicclass options in sip.conf as
> well as the various documented classes and modes within
> musiconhold.conf but I can't see how I tell it to just relay the media
> stream straight on.

Well, first, I was mistaken, and support for this behavior (passing
through the 'hold' signaling) has not in fact been added to chan_sip.c
yet, although it is supported in chan_iax2.c.

However, your last comment here doesn't make sense: if the remote party
put you on hold, there shouldn't be any media stream to 'relay' from it.
That's why we normally replace the missing media stream with locally
generated MOH. When (if) chan_sip is enhanced to support the
'mohinterpret=passthrough' setting like chan_iax2 has, then instead we'd
pass on the 'hold' signaling to the SIP endpoint that was placed on
hold, instead of sending it MOH. What it chooses to do to present that
hold state to its user (or farther endpoint, if it is another B2BUA) is
up to it, but in any case, there is no media stream to pass to it.

If you have an endpoint that is *both* placing you on hold and sending
you a media stream, that is broken. We don't have any concept of 'hold
with media' in Asterisk today.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org