I have a IP Office 406v2 running 4.0.5 software with a VCM 24 and about 33 5610 and 2 5621s. Also have 3 Phone 30s with about 60 analog phones connected. 2 PRIs for trunking. All at once yesterday for no reason known, all IP calls weather it be inbound or outbound connected the call and the caller could hear them but they could not hear the caller. Had user test with an anolog phone and all was normal. I ran a sniffer on the port of the IP Office and could see the H.323 setup correctly but the audio streaming was only comming from the phone to the IP Office, none from IP Office to the phone. A reboot fixed the problem but what could have caused this? Any ideas?