Just in case you haven't noticed AVM have released a new beta firmware, 84.05.09-21821. I gave it a whirl last night and, without making any changes to my setup (i.e. plugging and unplugging devices), saw the reliability of caller id improve significantly. Interestingly the 'Current power consumption' figure has increased from around 33% to 44%. I would say that 95% of the test calls I made had CLIP presented properly. I haven't fully tested it yet but I imagine that I would get a 100% success rate if I plugged the voice cable into the phone line without the DSL cable which seems to be generating noise and interfering with CLIP.
I am now at the point of considering switching from my Siemens DECT base station to the Fritz. However, the background white noise problem still remains on PSTN calls unless I do the chaining filter trick but this seems to prevent caller id from working, beta firmware or not.
I wondered what would happen if I put a standard dual BT splitter (i.e. not a microfilter) into the master socket and from there plug two chained microfilters into one and a single microfilter into the other. I put the DSL cable into the end of the chained two and put the voice cable into the single microfilter. I was hoping, rather than 'double filtering' the voice part I could try doubling filtering the DSL signal. Unfortunately, I still got the same amount of background white noise on PSTN calls.
I then plugged the voice cable straight into the BT splitter and in the other side of the splitter plugged a single microfilter into which the DSL cable went. I made a PSTN call and could hear really loud AM radio/modem white noise screeches as the ADSL modem in the Fritz!Box dialled up and maintained a connection. This is the first time I've heard the Fritz!Box 'unfiltered' and it is loud. I've setup many ADSL connections and routers over the years and I've never really heard noise like this on the phone line when an ADSL modem was connected, even when a microfilter wasn't being used. I can see now why people have varying success with caller ID displaying. Those very close to the exchange will have a stronger signal which can cut through this noise. I guess I'm a moderate distance from the exchange so I have intermittent success. Those far away probably don't have a strong enough signal to cut through this noise.
Interestingly though, smurf46, you report you don't get any noise on PSTN calls on your Fritz!Box. I would really appreciate it if you could try the test mentioned in the previous paragraph? I'm wondering whether you can hear this noise with your Fritz!Box; it would be a good test in terms of whether my unit is faulty. I never asked the question but I suppose you've tried just plugging your voice cable straight into the phone line without any microfilters and tested caller ID?
In light of this, then, until AVM can come up with some kind of fix to the noise generated by the DSL part of the router, I'm passing off this role off to another device and setting up the Fritz!Box in 'cable modem mode'. I'll probably go for one of these http://www.draytek.co.uk/products/vigor120.html.
Edited by nickterry (Fri 09-Mar-12 14:08:08)