[asterisk-users] WARNING[31046]: chan_sip.c:4978 process_sdp:Unable to lookup host in c= line, 'IN IP4 100101'

[John Faubion]

> Well can  you offer some explanation why T.38 faxing worked for months
> and then one day stopped working?

Generally it is because some one or some process did one or more of the
following:

1. Updated firmware on the ATA
2. Updated software on the server
3. Changed a configuration setting
4. Let the smoke out of a chip

AFAIK none of these devices or systems are using artificial intelligence,
yet. Therefore when something just quits you need to start looking for what
changed.

John