Problems with asterisk 11

Dear friends I am having trouble completing calls in Asterisk 11, recently did upgrade, I used version 1.6. When I call for an extension, but when called ring sends meets the softphone displays the message server failed, the asterisk just aborts the connection, I believe the problem is codecs, however I’m not sure the two extensions are configured for the codec U law , someone has gone through this problem?

Please read the Asterisk logs you will find almost for sure the cause of your problem

on linux you can run these commands and read the output carrefully

cat /var/log/asterisk/messages | grep -i error | less

cat /var/log/asterisk/messages | grep -i warning | less

too please show your Asterisk CLI output the next time, it is easier for us help you reading the CLI output.

In /var/log/asterisk/messages is not present error
In Asterisk CLI present message "Spawn extension (ura, s, 3) exited non-zero on 'SIP/1000-00000019"
the first step of the extension “ura” is the command playback, which runs smoothly with Asterisk 1.6, the same error happens when I call another extension sends the ring no more complete connection.