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Anyone experience audio lag on IP phone calls...

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tmac1961

tmac1961

Vendor
Aug 18, 2009
11
US
We have new install of CM5.2.1 with 9600 series IP phones. When end users make an external call, the audio connection is 2-3 seconds behind the signaling so the user is missing the first 2-3 seconds of the conversation when the far end answers. We have SIP trunks for inbound and outbound service. The H.323 firmware for the 9600 phones is 3.1.1 and I've also tried 3.0.1 firmware. This issue also appears when calling CMM voicemail. Internal station to station calls work fine.
 
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FYI...We resolved the issue. We found that the customer's ethernet switch port that connects to the G430 gateway was transmitting at 100/Half duplex. Had them disable auto negotiation and lock down at 100/Full. Now both ports are matching.
 
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