![]() The most comprehensive, realistic, and useful guide to Microsoft Lync Server 2013, today's leading Unified Communications system. In most cases this wouldn’t be an issue, but because my customer had 70X NXX numbers. For voice calls, this is fine, but for fax calls this is not a good idea. Pearson Education, 2013 - Computers - 933 pages. To workaround this issue, I could do two things: After all the digging it appears that there is a undocumented behavior within Lync 2013 where the Front-End service and Address Book service will read this local file before attempting to read the file share. Silence Suppression means that when the gateway detects that audio is under a certain threshold on the call, in an effort to save bandwidth, it will stop sending RTP on the link. Ensure that you turn off Silence Suppression (Voice Activity Detection) on all hops. ![]() However, if there is a fax setting that allows you to choose G.711 (passthrough), then it can often be a built in function of this setting. This functionality does not usually have explicit settings in a VoIP gateway. This trade off works because fax was built to handle fixed latency caused in long distance PSTN calling scenarios back in the good old days of TDM voice networks. What this does is reduce the chance of Jitter affecting the media stream, by increasing the overall end to end latency on the call. ![]() So some gateways will actively try and reduce the amount of jitter by increasing the Jitter Buffers (perhaps to 100ms) for calls that they detect as being fax calls.
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