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The number of simultaneous calls is dependent on the model of phone:

Model Simultaneous Calls Supported
SIP-T19(P) E2 3 Incoming or 2 outgoing
SIP-T21(P) E2 50 simultaneous calls
SIP-T23G 50 simultaneous calls
SIP-T27G 50 simultaneous calls
SIP-T29G 50 simultaneous calls
SIP-T40P 50 simultaneous calls
SIP-T40G 50 simultaneous calls
SIP-T41S 50 simultaneous calls
SIP-T42S 50 simultaneous calls
SIP-T46S 50 simultaneous calls
SIP-T48S 50 simultaneous calls
SIP-T53W 50 simultaneous calls
SIP-T54W 50 simultaneous calls
SIP-T55A 50 simultaneous calls
SIP-T56A 50 simultaneous calls
SIP-T57W 50 simultaneous calls
SIP-T58A 50 simultaneous calls
W52P 4 simultaneous calls
W53P 8 simultaneous calls
W60P 8 simultaneous calls
W80

100 simultaneous calls in total

Up to 8 simultaneous calls per base station

CP920 50 simultaneous calls
CP930W 8 simultaneous calls
CP960 50 simultaneous calls