Telephony as normal.

Examples:

A call to a German mobile number

• Number
  0179 54875
• Using sipkom, you dial
  0179 54875

A call to a fixed network number in Berlin

• number
  030 4711
• Using sipkom, you dial
  030 4711

A call to a fixed network number in Cape Town

• number
  0027 21 45758
• Using sipkom, you dial
  0027 21 45758

For local calls, it is no longer necessary to dial the area code before the actual number if you have activated the CLIP function for your sipkom fixed network number.