[Asterisk-Users] Music on hold on timing sources

[Eric Wieling]

C F wrote:

> When there is no timing source then MOH will not work, however
> asterisk can use the incoming RTP stream as the timing source, if the
> device you are trying to use don't send packets when there is no
> sound, then there is no RTP stream, therefore no timing source.

If Asterisk does not have incoming RTP then it will not send audio. 
It doesn't matter if you have Zaptel timer or not.  This has NOTHING 
to do with MoH.