WARNING[21998]: chan_sip.c:12747 handle_response: Remote hos

Asterisk Asterisk Support
1

Hello,
I noticed that my Asterisk 1.4.18-1 displays regularly this error message :

WARNING[21998]: chan_sip.c:12747 handle_response: Remote host can't match request NOTIFY to call WARNING[21998]: chan_sip.c:12747 handle_response: Remote host can't match request NOTIFY to call
It appends since I connected IP phones : 1 x Siemens S450Ip and 2 x Softphones (Zoiper).

I modified sip.conf to activate only one phone at a time, to debug this issue, without succes.
Here is the results of my check :

  • no IP phone => no more error messages.
  • activation only S450IP => many error messages.
  • activate only Softphone 1 => no more error messages.
  • activate only Softphone 2 => many error messages.
    => I don’t understand why Asterisk doesn’t have the same behaviour with the two softphones.

Can you please tell me how I can fix this issue ?

Thanks a lot.