I know you can set the upper/lower RTP port limit in autoload_configs/switch.conf.xml but, is it possible to have an upper/lower limit set and change it for a specific call?

For example:

switch.conf.xml has:

We have certain clients that require a VPN connection to reach our servers, and the VPN blocks all UDP traffic from ports >10000.

One solution would be of course just to lower our range, ok... But is there a way that I can set the RTP port range for a specific call?

Something like this in diaplan:

[...]

<action application="set" data="rtp-start-port=3000"/>

<action application="set" data="rtp-end-port=4000"/>

[...]

I don't know if this is doable some way... If FS doesn't have this option, maybe with a Kamailio + rtpengine in front we could potentially achieve this?

Thanks!

Best regards, 

Joel.