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[jel3800]

Have DIR-625 Rev A Firmware 1.09 installed for about 6 months.  Usually works fine except for an intermittent issue associated with in-bound VoIP calls.  At times when the handset is answered the router re-boots and all connections (WAN LAN) are dropped.  This is confirmed via router log (no error message captured but boot messages reflected in new log) and Connection Up Time Statistics(Status; Device Info; WAN).
ISP is Comcast with vendor supplied Cable Modem,
Tested download typically in 15,000kbps range
Router reported Upload speed 827kbps (QOS Engine Setup)
Vontage Adapter Product Information
Model Number   VTA
Ethernet MAC   00:19:5B:77:13:C7
Software Versions
Firmware   VTA-11.4.1-r060815-1.00.09-r070401.img
Boot Loader   1.3.8.1602

Problem never occurs with outbound calls and not consistant with in-bound calls.  When it does happen it is just after handset is picked up to answer.   It seems to happen in clusters over a period of hours or days and 80-100% of inbound calls are affected for that period - again no outbound calls are impacted.   

We did replace all wireless phones with 5.8 Ghz system as initially we were having an interferience issue which caused wireless workstations to drop connections when handsets were used.  This upgrade did resolve that problem and the current issue is seems not related with wireless operatioin but rather the entire router fails and re-boots.

[Lycan]

replace the wireless phones with hardwired ones and tell me if the issue continues.

[jel3800]

We do have 1 wired phone in the mix and have not had issue when that 1 was used....however it is not suitable to be in the location that most calls are answered at, and the intermittent nature of the occurrence makes it difficult to draw absolute conclusion.  I understand the diagnostic process here and have already replaced all original phones, which were causing a conflict with individual workstations, with 5.8 GHz system.  The current issue is very different from the rf conflict experienced earlier (and experienced with another brand router even earlier) as it impacts the entire router.  That said I will try to use the wired phone more but that may be inconclusive as a non-failure does not indicate a fix - there have been no reboots for the last 2 days with a significant number of inbound calls.  Also note there has NEVER been a reboot generated by outbound calls using the same wireless phones.

Thanks for the response and I will try to use the wired phone more but am much more likely to replace the router than to replace all wireless phones again.....