I have an Asterisk 13.6.0 server using CHAN_SIP this server is use as the CDR registration server for my customers, so Onpremise and hosted PBXes are connected to it and is the central sever through which all calls go.
Sinds a few days i have problems with keeping the peers reachable, i am using qualify to monitor the the peers and keep NAT happy if it is used.
I have qualify=yes in the peer, and qualifyfreq=20 and Keepalive=25 in general section.
i have lowered the qualifyfreq i was qualifyfreq=60 but this did not help.
A network capture did not tell me any special, i see the OPTIONS beeing answered within ms sec
Some of the peers are even on the same subnet/switch (L2 link) and do not use NAT.
What i do mis is that Asterisk does not log the peer als UNREACHABLE, i seems to just silently remove the IP adres and set it to (Unspecified) this all seems to happen within a minute.
I even set some peers to qualify=no but after some minutes these peers also report (Unspecified) for the IP
All answers i have found did not fully resolve my issue, and i hope someone has some suggestions.