I tried this as you suggested
No source RPM found for asterisk13-13.22.0-1.sng7.x86_64
No source RPM found for asterisk13-13.19.1-1.sng7.x86_64
No source RPM found for asterisk13-13.21.1-1.sng7.x86_64
No source RPM found for asterisk14-14.7.5-1.sng7.x86_64
No source RPM found for asterisk14-14.7.3-1.sng7.x86_64
No source RPM found for asterisk14-14.7.4-1.sng7.x86_64
Did an install just to test this , no luck