HKBN 2b + Asterisk: How to limit the number of call per each 2b number?

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Since the HKBN 2b does not limit the number of calls per each subscribed HKBN 2b number, you can make as many call as you like. However you may receive a warning letter from HKBN 2b for the abuse use of HKBN 2b service. You may be advised to purchase more HKBN 2b numbers or you have to limit the number of parallel calls via HKBN 2b telephone number to 2 using the following command for each trunk:

[hkbn2b-1]
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call-limit=2
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context=from-hkbn