[asterisk-users] The identifier parameter in Dial() command

[Songtao Yu]

Hi All,

I am new to Asterisk. Now I got one question on the identifier parameter of the Dial() command. I saw as below:
exten => 20,1,Dia(Zap/3/5551234).

Would you please let me know the meaning of "5551234"?

Thanks,
Songtao
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