i think in this case the kamailio does not need to change the From Header at 
all. But for any reasons i compares old with new URI (according the code) 
During this the kamailio changes the From header to this:
```
<sip:127A946"0DDloqbpiumQD
```

There are lots of failure messages in the log describing exactly this. On 
kamailio except for the error message nothing breaks. On the A side of the call 
(in our case an asterisk) the Bye gets pardes and here the parser stops at the 
quotes. This is not an allowed character in a SIP URI and the Parser ends with 
an error and reply back with "Bad Request"

As far as i understand SIP the change by kamailio of the from URI is not needed 
in this case and causes a hanging call.


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