Though the exact number of simultaneous phone calls a SIP Trunk can handle depends on the specific provider, each SIP Trunk can manage at least 20 simultaneous calls. Remember that each SIP Trunk is actually a bundle of phone lines and channels that all operate via a single SIP connection. Though technically, there’s no limit to the number of channels available per SIP Trunk, consider how call quality may suffer if a Trunk is split into too many channels.