Hi, > Next Step would be to check/update the firmware on your phones or router.
I dismissed this advice at first, but it was the one that worked in the end. The D-Link DSL-2500U ADSL router was to blame, it must have been interfering with SIP packets (maybe an outdated version of the SIP conntrack module or something like that). The 1.50 firmware version solved the problem and also gave the impression of working faster overall than 1.20. Thanks a lot. Roman.
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