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Dead silence when IP phones connecting via WAN

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Sklavin

Sklavin

Technical User
Mar 25, 2010
4
PL
Hi,

I have few phones connected to PABX via WAN link. For about 2-3% total calls caller hears silence just after is connected. Any suggestion how to start debugging process ? We looked at WAN traffic and we did not find anything interesting (filters, packet drops, bandwidth problems etc.)
 
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OK, we finally found solution - some ip phones get DHCP other network IP addresses which was blocked by WAN firewall.
 
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