The partner of a player who asks a question may not ask a supplementary question until his turn to call or play.
直到轮到其叫牌或打牌前询问牌手的搭档不克不及补充询问。
2
This Recommendation specifies the DSS 1 signalling requirement on the N-ISDN user-network interface for the Explicit Call Transfer (ECT) supplementary service.