IAX2 Problem For WAN Connections

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Asterisk Users 3 Comments

Hi,

I am trying to connect two Asterisk servers using IAX2. Everything works fine when I couple them within a LAN segment, but not when I connect them using WAN connections. I made sure that the routers’ ports are mapped properly and checked this with additional ssh rules.

ServerA is a Raspberry box with the vendor’s Asterisk version 1.8.13.1 and ServerB is normal CentOS 7 box with Asterisk 13.1.

Calling from ServerB to ServerA works, but not vice versa. The only odd thing that appears to me is the different perceived port on ServerA.

ServerA*CLI> iax2 show registry Host dnsmgr Username Perceived Refresh State
80.152.xxx.xxx:4569 N ServerA 79.233.yyy.yyy:45697 60 Registered

ServerB*CLI> iax2 show registry Host dnsmgr Username Perceived Refresh State
79.233.yyy.yyy:4569 N ServerB 79.233.yyy.yyy:4569 60 Request Sent

Does someone have an idea at what to look in detail?

jg

3 thoughts on - IAX2 Problem For WAN Connections

  • Basically I used the example from the Asterisk book “Connecting Two Asterisk Boxes Together via IAX” and there is not a lot to see:

    ; Server A
    [general]
    ; this box remote IP
    register => ServerA:very_secret@80.152.xxx.xxx

    disallow=all allow=alaw allow=ulaw allow=gsm

    jitterbuffer=no forcejitterbuffer=no autokill=yes

    ; the other box
    [ServerB]
    type=friend trunk=no auth=md5
    encryption=yes secret=very_secret context=from-ServerB
    qualify=yes host=dynamic
    ; end of Server A

    ; Server B
    [general]
    ; this box remote IP
    register => ServerB:very_secret@79.233.yyy.yyy

    disallow=all allow=alaw allow=ulaw allow=gsm

    jitterbuffer=no forcejitterbuffer=no autokill=yes

    ; the other box
    [ServerA]
    type=friend trunk=no auth=md5
    encryption=yes secret=very_secret context=from-ServerA
    qualify=yes host=dynamic
    ; end of Server B

    If I replace the WAN addresses of the two routers with addresses on the LAN, everything works. Currently, I am not sure whether it could be a NAT related or Asterisk configuration problem.

    jg

  • I found a way that works. Essentially, I deleted the register lines and added the hosts with deny all and specific permit specs. I don’t know why it works, but it does.

    jg