Getting error of: Got reject for frame 52, retransmitting

Updated to Asterisk 1.4.0, zaptel 1.4.0 and libpri1.4.0 and started getting a hundreds of errors like below:

[Mar 28 08:36:33] ERROR[2686] chan_zap.c: !! Got reject for frame 52, retransmitting frame 55 now, updating n_r!

Systems seems to running ok and answering calls coming in on PSTN.

Is this really a problem and if so, what is it, and how do I stop it?


Iโ€™m getting the same errors by buckets. And i donโ€™t know if it is related but when lots of calls enter at the same time, some of them get cut.

Anyone that can explain this error?

I backed down to asterisk-1.2.17, libpri-1.2.4, and zaptel-1.2.16 and the errors vanished.