01-26-2009 09:11 AM - edited 03-15-2019 03:46 PM
Hello - we have a CallManager 5.1(1) installation with several VG224 for analog phone/fax/modems. We've been having some problems with the faxes and modems and also an occasional problem dialing out where the recipent cannot hear us (on our Cisco VOIP phones - 7941/7960's). I feel like I may need to do some QoS setup which we really haven't done much with prior to now. A little about our set up...we have a core 4510 switch with 4 other wiring closets with 3560s. Like I said we also have 4 VG224s. We have fiber out to two 2811 routers and T1s from there to the local phone company. I am not familiar (much) with configuring QoS. Can someone point me in the right direction (either for reading material to get up to speed) or other information to find out how I can start configuring QoS. Thanks in advance.
01-26-2009 10:17 AM
01-26-2009 11:37 AM
I agree with Nick. While QoS/CoS should be considered at every level, it probably would not cause the problems you describe on a LAN.
The fax/modem issue sounds like a codec selection problem. Have you confirmed that you are using G.711 on all fax/modem lines? QoS is not going to help a fax on G.729.
As for the one-way audio... I haven't heard of QoS causing one-way audio issues. That is probably a routing or a firewall/access list problem.
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