Here are the requested details:
I am using Sipdiscount as the VOIP provider,
I use an AVM FritzBox Fon WLAN 7050 (which is a router with an integrated firewall) Firmware-Version 14.04.01,
I use a normal phone (AEG) with touch tone facilities- no problems at all with VOIP calls as such apart from my question,
I have DSL 2000,
use Windows XP and Avira AntiVir Personal Edition Classic.
Thanks for your assistance.
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