According to the regulations, if Party A operates on Party B's radio station as a "guest operator," there are two options for using call signs within Tonglian: one is to use the call sign of the radio station operated by Party B. Since it is Party B's radio station that actually transmits the signal, using Party B's call sign is logical and natural. If Party A has obtained a ham radio operator certificate but has not yet set up their own ham radio, this is their only option.
Another option is that, in addition to using its own call sign on a specific radio station operated by another party, the operator must also prefix its original call sign with the Chinese prefix "B" and the area code of the operating location, followed by a forward slash "/". For example, if the operator's original call sign is BG3ZZZ, and the call sign of the other radio station is BG9YYY, the operator can use the call sign "B9/BG3ZZZ".
Regarding situations where the operating area for a provincial call sign is the same, such as when someone with call sign BI1AAA contacts someone with call sign BI1BBB within the same province, should they also use the call sign "B1/BI1AAA" in addition to using BI1BBB? Or can they simply use "BI1AAA"?
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