Syntax for wildcard/range/all SIP Extensions for sip_custom_post.conf

I see that I can put the following syntax in my sip_custom_post.conf:

5601
subscribemwi=yes

What I’d like to do is to add the subscribemwi to all extensions, instead of listing each extension out one-by-one. Is there any syntax which will allow me to do this?

Thanks so much!
Dave