Multihomed client: internal (wifi) and external(4g + nat)

#1

Dear all,

I’m trying to deploy a pbx for allowing softphones in mobile devices to work:

  1. From internal wifi network when connected.
  2. From anywhere (4g/other connection) when disconnected or out of range.

Details of the deployment:

  • asterisk v16.4.0 with bundled PJSIP, ICE enabled in RTP and endpoints, directmedia=no
  • Independent network card for internet access via NAT (10.0.1.0/24)
  • Independent network card for Wifi network (192.168.1.0/24)
  • Softphone registration: I’m using a DNS pointing to the external IP address.

I succeded to make it to work with NAT loopback enabled in the router but in the Wifi the RTP flow like this:

normal endpoint <-> pbx to <-> external router <-> pbx <-> external router <-> multihomed endpoint

Should not ICE handle this situation and avoid using the external router for connecting the endpoints?

The IP address configured in the Wifi network interface is offered as a candidate:

a=candidate:Hc0a801c8 1 UDP 2130706431 192.168.1.200 12370 typ host

Should not asterisk directly connect using this interface instead external router?

–
I found this other thread 74276, but it’s related to handoff from 4g to wifi, in this case it’s not required.

Best Regards.

#2

You’d need to show the actual SIP traffic and a packet capture. You can also enable debug in logger.conf and set it to level 3 (core set debug 3) which will output what the PJNATH ICE implementation is doing.