Hi.
Does extension 5500 in context ramais exists?
yes
Was the channel SIP/9999-000088a4 active at the time of the command?
yes
If so, then it is an asterisk bug, you will probably need to update. There are a bunch of versions (semi latest versions, in >1.6 and .18, with broken AMI redirects, perhaps the atxfer is also affected.
I'll take a look in the changelogs.
For the full log to be useful, you might need to increase the debug and verbose level to the max (core set verbose 10, >core set debug 10).
I did that but I didn't find 5500 in logs.
Regards,
Marcelo H. Terres