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When you play back message,that WILL affect dtmf recognition in most cases. Only case when it will not affect is case when user call from digital phone via digital protocol(sip/iax2). If user call PSTN line, then sound in both direction go via same wire, as result playback can be louder then dtmf or have similar frequency, that will affect recognition. But ...


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You need to create a trunk (can be SIP trunk or IAX trunk) between the two PBX and then you can reach the IVR of the other PBX by passing through the trunk, here a quick example of how-to create a trunk and there is also an example of how-to reach a resource on the remote PBX http://www.asteriskdocs.org/en/2nd_Edition/asterisk-book-html-chunk/...



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