Configuring NAT is not the only option. I have the same issue with outgoing local port with my local telco, and in my sms application written in perl I have easily passed it with LocalPort option of IO::Socket::INET object. I think it is done with bind(2) and can be easily implemented in kannel.
- Source TCP port for Kannel Misc
- Re: Source TCP port for Kannel Stipe Tolj
- Re: Source TCP port for Kannel Paul P Komkoff Jr
- Re: Source TCP port for Kannel José Borges Ferreira
- Re: Source TCP port for Kannel Andreas Fink
- Igor Ivoilov