One thing you could try is, press the speaker phone button, then turn the volume down say one or two notches... Then retest and see if the problem abates or goes away fully.
If the voice coming out of the speaker is quite loud, then the MIC will have some issues when sampling the voice, I don't think they are built with the same abilities as the 7900 series, hence the pricing I guess
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Yes we are having issues with a deployment of SPA508 where the phones are close enough that when a page is done you often hear some of the phones start to make the announcment and then stop. (The others continue)
We have Cisco looking into this for us - An interesting thought is raised above...
The 'announcment' should be just that and should not be effected by ambient noise - but could this be the problem as to why they stop? We are not using them for two way intercoming as such just for announcments/paging.
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