ISDN PRI

Guys,
Today I saw an isdn pri configuration(result of using show run command).
interface Serial1/1:15
no ip address
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
this is a part of the configuration.My doubt is that what is the meaning of the command
"isdn incoming-voice voice" and do we have to include this command for all the isdn pri configurations or is it one among those commands that are auto generated and appears when we give the show run command.
Today I saw an isdn pri configuration(result of using show run command).
interface Serial1/1:15
no ip address
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
this is a part of the configuration.My doubt is that what is the meaning of the command
"isdn incoming-voice voice" and do we have to include this command for all the isdn pri configurations or is it one among those commands that are auto generated and appears when we give the show run command.
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