From one moment to another i started having my cisco sip phone producing this message on the asterisk server:
Feb 3 03:35:55 NOTICE chan_sip.c: No header field ‘Via’ present to copy
The IAX phones continue working. The SIP phone cannot dial any number and it only produces that error on the asterisk server.
I guess i haven’t changed anything on the asterisk server or on the phone.
What could be producing this error?