for when it does'nt work, i believe your getting a feedback "the no. is not in use" which is from the pstn, so i assume your not even reaching the ccm,
if your network is not that big and your router is powerfull enough, run a debug dialpeer and check the dialpeers matched for incoming calls.... if you could paste the config of ur router we could maybe analyse...
the error is coming as " incorrect no". and u r correct our network is not big. as u mentioned not reaching ccm but after some time issue get resolved and users get incoming call. this issue is coming again nd again. today i happed 3 times and resolved itself. friend i don't have acess on router so its not possible to check the config. Can u tell me where exactly this problem is ? i have checked the pri status with isp but no alarms found.
i dont think the problem is on your side, as a test do the following: try to make around 3-5 simultaneous calls from the outside to 5 different extensions in your org... see what happens, if it cuts out on simultaneous calls then it may be the DSP's in your router are faulty or maybe the timeslots on ur router are somehow deleted but it could also be a problem with the incoming E1 line to your router... sorry but with my limited knowledge my brain cant think much without the config of the router and the network topo.... try the above and see what happens.
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