How to call outside the SIP provider, e.g. gigaset.net?
There is a home voip Siemens Gigaset A580 IP. Set up two SIP provider gigaset.net and bestvoipreselling (one of the crowd DELLMONT SARL). Connection to the wired telephone line no. I would like to call from outside, i.e. mobile phone, home tube attached to the above-mentioned database. Is there any possibility to call on the available sip accounts without paying an outside phone number?