I find that with Ingate and MOH, there is an issue if you put a MOH uri in the 
ingate with some ITSP's in that audio won't resume (hold, transfer, etc.). We 
found it does work with 4.0 if you are running ingate firmware 4.7.1 assuming 
you also use ingate for the remote worker), which was released recently. It may 
be different depending upon your ITSP.

We found disabling MOH for the ingate (leave on hold as it is in ingate) solved 
audio resume issues overall prior to 4.0 and ingate 4.7.1, but that's not fun.

>>> "Mark Gertsvolf" <[email protected]> 05/29/09 2:17 PM >>>
We don't seem to have an external tracker for Ingate, so I don't know
how to report this issue, but there is an issue with Ingate when sipXecs
4.0 is deployed behind in with Ingate remote worker module.
MOH can not be delivered to remote worker. The reason is that the MOH
offer to remote worker is send with "sendonly" direction attribute.
Ingate can't start sending music the phone until the phone sends RTP
first, since Ingate is doing late binding procedure. However, since
remote worker phone is told not to send media, Ingate never receives RTP
from the phone so, it Ingate can't start sending music.

Comparing this to the native sipXecs 4.0 remote worker solution:  MOH
works as expected with native remote worker module!
Remote worker plugin determines that the MOH offer is "sendonly" and is
destined to remote worker. It then changes the direction attribute to
"sendrecv" and music is successfully delivered to the phone. 

I have been running sipXecs behind a NAT with 2 ITSPs and support for
remote worker and apart from a few issues, which have been addressed
recently, it is working really well. sipXecs 4.0 is a really nice
product for this setup.

Kudos to Bob and Ranga and the whole team!


Cheers,
Mark.






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