Among the following types of boards, the one that can provide the function of connecting the U1960 to the PSTN is () (single choice)
When the eSpace 7900 series phones are restored to factory settings, which of the following statements is correct is () multiple choice
In the SIP protocol, the Cancel transaction can be used to cancel the Update transaction. () Right or Wrong
Add active and standby SCs on SMC2.0, which of the following statements is correct () (multiple choice)
SMC2.0 does not support manually defining the number of channels for multi-channel cascading (). Right or Wrong