Dropping incompatible voice frame error

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Greetings,

We have an old analog phone system running Asterisk 1.2.13 (not my choice lol). Everything has been working wonderfully until today. The site is experiencing dropped and missed calls. When I tried calling the site, I did get through however the CLI was flooded with hundreds of copies of the following:
Jan 25 15:46:54 NOTICE[2343]: channel.c:1956 ast_read: Dropping incompatible voice frame on Local/4227@from-sip-a3d8,2 of format ulaw since our native format has changed to slin

I tried Googling the error but unfortunately, there were lots of reports of the problem and not a single solution or fix. My thinking is that it has to do with the service provider but I want to do my homework before pointing the finger.

Any assistance would be greatly appreciated.

Thanks!

Kevin Oravits
Phone Sys Admin/Tech Admin