The scenario consists on a NGN Softswitch, Asterisk server and a SIP trunk between them. The SIP trunk have no problems, but from MSoftx3000 the SIP packets are being sent from port 5061, despite that the configuration was specified to use port 5060.
SIPTG ip pair information
IFM Module = 132
Local server port = 5060
Remote URI = 172.31.20.19:5060
Master/Slave type = Master
Second Remote URI = 255.255.255.255:65535
Second Master/Slave type = Slave
Techprefix = NULL
IsDeleteTechprefix = True
Protocol Type = UDP
PBX Equipment ID = NULL
PBX Domain Name = NULL
We have asked customer to share the packet capture information, and the MSoftX3000 version.
We have informed customer that this behavior is normal, because when softx3000 is client, the peer side is server , the softx3000 will use the local port, this means , softx3000 will send the message with the MSGI port
If the softx3000 is the server, the peer side send the message to the port we will use. In the message, the peer side send the message to 5060
We will reply with 5060.