[Serusers] Problem with ATA 186

[Teran Jesus]

Hello, i have a problem with the ATA 186 in the SER 0.9.6, when i generate a
call from my ata, when the ATA received the OK from the SER, the ATA don't
generates the ACK correctly, this missing  the user in the ACK,  something
like this,  ACK sip:XXX.XXX.XXX.XXX SIP/2.0,  i believe the sip poroxy is
missing something in the OK, because i have tested this in the SER version
0.8.12 and this don't have the same problem. Do you know how can i resolv
the problem?