[asterisk-users] Getting: Can't fix up channel from 5 to 7 because 7 is already in use, and pri_dchannel: Answer requested on channel 0/7 not in use on span 1

[Håkon Nessjøen]

System have been working great for weeks, using an average 40 of 120
dahdi channels.

But today, I suddenly see scary things like this:

    -- Moving call from channel 5 to channel 7
[Feb 25 10:18:12] WARNING[17129]: chan_dahdi.c:10608
pri_fixup_principle: Can't fix up channel from 5 to 7 because 7 is
already in use
[Feb 25 10:18:12] WARNING[17129]: chan_dahdi.c:11535 pri_dchannel:
Ringing requested on channel 0/7 not in use on span 1
    -- Moving call from channel 7 to channel 12
[Feb 25 10:18:12] WARNING[17129]: chan_dahdi.c:10608
pri_fixup_principle: Can't fix up channel from 7 to 12 because 12 is
already in use
[Feb 25 10:18:12] WARNING[17129]: chan_dahdi.c:11535 pri_dchannel:
Ringing requested on channel 0/12 not in use on span 1
    -- DAHDI/4-1 is ringing
[Feb 25 10:18:17] WARNING[17129]: chan_dahdi.c:10608
pri_fixup_principle: Can't fix up channel from 5 to 7 because 7 is
already in use
[Feb 25 10:18:17] WARNING[17129]: chan_dahdi.c:11680 pri_dchannel:
Answer requested on channel 0/7 not in use on span 1
[Feb 25 10:18:22] WARNING[17129]: chan_dahdi.c:10624
pri_fixup_principle: Whoa, there's no  owner, and we're having to fix
up channel 5 to channel 7

[Feb 25 10:21:44] WARNING[17129]: chan_dahdi.c:10661
pri_fixup_principle: Call specified, but not found?

What would be the reason for things like this to happen?

And are they really just warnings (as it says), or actual errors,
where something bad is happening to the actual calls, or calls not
acknowledged?

Håkon