The cost of a SIP Trunking service is significantly determined by the cost of one SIP channel as charged by the provider chosen by you.u003cbr /u003eu003cbr /u003eAnu003cstrongu003e average of $10 is usually charged for one SIP channel monthly on the lowest plansu003c/strongu003e of SIP providers and anu003cstrongu003e u003c/strongu003eaverage of $25 monthly is charged on the highest plans that could offer you unlimited SIP channels.u003cbr /u003eu003cbr /u003eu003cstrongu003eCall rates can be unlimitedu003c/strongu003e but are usually u003cstrongu003echarged for $0.001 per minuteu003c/strongu003e and otheru003cstrongu003e extra costs such as setup fees u003c/strongu003ecan also be charged by SIP providers.