On a Xenial test VM with build-ppa enabled:
ubuntu@test-x1:~$ dkms status dahdi, 2.10.2~dfsg-1ubuntu4, 4.4.0-178-generic, x86_64: installed dahdi, 2.10.2~dfsg-1ubuntu4, 4.4.0-179-generic, x86_64: installed
On a Xenial test VM with build-ppa enabled:
ubuntu@test-x1:~$ dkms status dfsg-1ubuntu4, 4.4.0-178-generic, x86_64: installed dfsg-1ubuntu4, 4.4.0-179-generic, x86_64: installed
dahdi, 2.10.2~
dahdi, 2.10.2~