I would be grateful to have some advice on this strange thing I am observing.
Users are complaining that there are one way voice sometime and it is quite random and intermittent. Most of the times it is fine but sometime there are issues when the caller is not being able to hear but the called person is able to hear.
The strange thing is that if Site A calls Site B then Site A is not able to hear but site B can hear; again if site B calls then the roles are reversed and Site B cannot hear now but Site A can hear.
Have anyone seen this kind of issues before? and what the potential problems could be
I have added it hope it fixes this. but if anyone else can give any insights please advice.
Configure voice rtp send-recv on the gateway—Sometimes you have one-way audio problems only when calling specific numbers, such as 411 or 911 in the North American numbering plan (NANP) or after you transfer a call or put it on hold. If you are having these problems when going through a Cisco IOS software voice gateway, be sure that the voice rtp send-recv command is configured on the gateway. Numbers such as 411 and 911 sometimes do not send back answer supervision (that is, an ISDN connect message) when the remote end answers. As a result, the Cisco IOS software voice gateway does not cut through audio in both directions to prevent toll fraud. Configuring the voice rtp send-recv command forces the voice gateway to cut through audio in both directions immediately
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The short answer is that you don't.... That isn't entirely true while at
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