Hi, Thanks for the replies! Setting the packetization period did improve quality, however other issues arrived in the meantime: NAT traversal issues. The setup is as following:
ITSP <== sipxecs ==> ACD agent. sipxecs is running for testing purposes without firewalling on a public routable address (no NAT). the ACD agent is configured as a remote worker and is behind NAT. Calls to the PSTN via the ITSP are working fine, and so are locall calls between remote workers. But as soon as the ACD server enters the stage, problems arise! Incoming calls via the ITSP are routed trough an auto attendent to the ACD queue. When the agent answers, no audio is heard in both directions. The auto attendent is working fine. A sip trace points out, the call gets re-invited between the ITSP and the ACD agent without sipx staying in the media path. Therefore, the audio issues arise. When calling without using the ACD (either from PSTN/ITSP or local) sipxecs stays in the media path. Could anyone point me in the right direction what is causing this problem? Kind regards, Remco. ----- Original Message ----- From: "Paweł Pierścionek" <[email protected]> To: "Remco van Vugt (Raffel Internet)" <[email protected]> Cc: [email protected] Sent: Woensdag 7 april 2010 03:53:05 GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna Subject: Re: [sipx-users] ACD sound quality / clicking noise On 2010-04-07, at 00:53, Remco van Vugt (Raffel Internet) wrote: Hi, I've been testing Sipxecs (4.0.4) running on both Xen (plenty of resources) and a dual-PIII - 1.4 GHz with 4GB of RAM. Sipxecs turns out to be a great piece of software, and nearly ready for production use, except for one annoying problem: a clicking sound is audible on calls being bridged trough the ACD server. At first, i suspected the Xen virtualisation because of the well known timing issues with RTP so I did a fresh install on the P-III box only to find out the problem still exists! On calls bridged trough the ACD server, a clicking / chopping / rumbling noise is heard in the background when the other side is talking (when both ends of the line are silent, no clicking noise is heard). Voice is sometimes distorted as well. I played around with codecs, but nothing helps. I tried a downgrade to 4.0.2 but that didn't help either. [..] Kind regards, Remco. Make sure all ends use muLaw and set 20ms packetization period on SPA. Pawel, -- Met vriendelijke groet, Remco van Vugt Raffel Internet Tinstraat 4 4823 AA Breda Nederland T.(algemeen) 0165 - 820010 T.(direct nr.) 0165 - 820015 F. 0165 - 820019 M. [email protected] W. www.raffel.nl KvK. 20144187
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