Hi - I have a client that is suffering real frustration with regards to their phone system that we have installed and have got to the point of shouting about it, so its not good.
They have a SPA9000 with 2 SPA400's and 15 SPA942's. All configured by the wizard, connected to a Cisco 24port POE switch, with all connected voice ports designated as fast and basic DCSP enabled. Router is a Vigor 2820, with QOS disabled as it is a dedicated ADSL for the voip. There is NOTHING else on the network apart from these phones and the SPA9000/942.
All incoming calls (4 PSTN lines) come through one of the SPA400's and all outgoing calls go over the ITSP.
I have sorted out the phantom call problem by disabling call back on each phone, but they are still getting serious incoming call problems - and regularly. All of their incoming calls at some points fail completely and their is so much distortion that the people calling cannot be heard. Now this has GOT to be an internal network problem, as it is coming in over a PSTN line directly to the SPA400. They are also getting the 3rd call being dropped, so that the third call that is made is not getting through to them.
Everything was set up via the wizard 2-1-0-0, and has been configured as per installation guide.
I have checked with BT that there is no call waiting, the only service applied to the line is caller ID.
I will be doing a full factory reset and reinstall tomorrow, but if you have any ideas on this I would appreciate it as I have been struggling with this for weeks now.