It was a slip clock problem due to the network.
In worst cases the crackling noise increases time by time, then the IPO restarts to force a clock re-alignement.
You could try with clock settings in "fallback" or "not used"
You can set several as Network and as Fallback. Somewhere in the IP Office Installation manual there is a description of the order in which they will be used if a clock signal is available.
Clock Quality: Default = Network
Sets whether the IP Office takes it clock source for call synchronization and signalling from this line. One line connected to the IP Office should be set to Network. and wherever possible this should be a line connected to the central office exchange. Another line can be set to Fallback but all other lines should be set to Unsuitable.
Im interested in the out come of this as we are suffering call issues (dropping / fading / clicking / cutting off ) on a couple of sites and wonder wether this could be similar
RotoOrb
you started the thread but haven't replied yet, any news on the clicking?
bas1234 asked if it happens on all lines or only specific ones, I am out of the ISDN for about 10 years but I had clicking in conjunction with bit errors on ISDN before, so if it is only a specific line then that could be the issue, if it is on all lines go for the clocking
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