![]() I've seen this with video conferencing over the internet as well as a mpls network. If you are near saturation on your downlink and you burst above your CIR for a period of time your ISP will start dropping packets to get you back to your CIR. If I discount that you testing the link right at the router and said its good, I have seen something similar with networks where there is a CIR rate and a burst rate. You also noted that the audio stream dies somewhere in the switch or in a switch to switch link.Ģ) How many switches are between the router and PBX?ģ) When you have this no audio condition can you ping the PBX?Ĥ) Is there anything special with this switch, are you using qos or vlans?ĥ) Are you using a SIP carrier or are you connecting to a PSTN?Ħ) Does any internal calls traverse this switch in question?ħ) As Scott mentioned do you have SIP-ALG disabled on your firewall?Ĩ) What speed is your internet connection (up and down)? Through your testing you think it is a LAN issue (very rare unless you are using 10/100Mb unmanaged switches). ![]() Initially I would think that you have a saturated downlink from the internet, but I find that hard to believe. ![]() In your case the near end is getting no audio for 10-30 seconds (one might think the call would be dropped if there was 20 seconds of silence by the PBX). This is typically caused by a congested uplink connection to the internet. Typically when there is an audio problem, and it is one way the far end will have garbled audio and the near end (at your site) will have good audio. ![]()
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