Asterisk will bridge a call in some cases and not in others. If codec conversion is required between phones, its stays in the middle. If the two phones can agree upon a common codec, etc, * is not in the middle from a pure communications perpective. In that particular case, what the phone does when the # key is press is totally a function of how the phone was programmed (and not asterisk). If the phone, as an example only, has an implementation bug that says I'm not going to forward the # key to asterisk during a conversation, obviously * can't interpret it.
Good explanation. Gratefully stolen to the Wiki. Thank you! See http://www.voip-info.org/tiki-index.php?page=Asterisk+SIP+media+path
/O
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