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@Old_TyT
1. look for the SIP operator with the lowest prices;
2. raise your PBX (Asterisk, etc.), use a GSM gateway (such a piece of iron, with a SIM card) and look for the most advantageous tariff plan from mobile operators (the choice strongly depends on the required number and duration of calls and on the directions of calls ).
H
hint000, 2021-08-11 @Old_TyT
There is no free, free only within your own infrastructure.
If there was a free option, it would bankrupt cellular, IP, and conventional telephony operators.
Well, or how to reduce the cost of SIP-telephonyThere are two ways:
1. look for the SIP operator with the lowest prices;
2. raise your PBX (Asterisk, etc.), use a GSM gateway (such a piece of iron, with a SIM card) and look for the most advantageous tariff plan from mobile operators (the choice strongly depends on the required number and duration of calls and on the directions of calls ).
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