enable topoh hiding only when outgoing interface is external ( mask contact and Via ip only when ougoing interface is external
or if it is not possible to enable it only in one direction.i want to know how to configure dynamic(for example in xavp or avp) ip to put in Contact and Via when topoh is enabled.

i see that the 'mask_ip' parameter of topoh module is a string. so we can not set a dynamic value here unfortunately.

Thanks