However, two weak points:
* The numbering plan is difficult to implement
* The firmware was not updated
These weaknesses can be corrected as soon as it buys / rents are produced by a supplier.
Otherwise, SIP account setup was relatively simple. Installed with my parents, they do not even know they go through this. For them, the use is completely transparent. The only change now: they have 24/7 phone. (VoIp them with their ISP was often punctuated service interruption which were weekdays)
