Sorry, just found the solution by specifying the problematic version and giving negative priority (instead of forcing downgrade).
Package: linphone* Version: 3.6.1-2.6 Pin: release n=stretch Pin-Priority: -10 On Sun, Jul 3, 2016 at 12:35 PM, Francesco Montanari <franz1010...@gmail.com > wrote: > Hi, > > I am on Stretch and the default linphone version is unusable for me (I got > reported bugs #743494). However Jessie's version works, so I pinned it in > /etc/apt/preferences: > > Package: linphone* > Pin: release n=jessie > Pin-Priority: 1001 > > However, the version is quite old (e.g. lacks of ZRTP support). Is it > possible to put a condition such that it should prioritize version > 3.6.1-2.4 (jessie) over 3.6.1-2.6 (current on stretch), but upgrade if >= > 3.7 becomes available on stretch repositories? > > Cheers, > Francesco >