asterisk users - Jul 2005 - 2 asterisks connected but trying to bridge call and this is not wanted

Guys.. I have a problem with 2 asterisks connected together but each time
one tries to call another I get this:

    -- Executing Dial("SIP/fozy-dfbc",
"IAX2/voip-gw/201|60|mwtWT") in new
stack
    -- Called voip-gw/201
    -- Started music on hold, class 'default', on SIP/fozy-dfbc
    -- Stopped music on hold on SIP/fozy-dfbc
    -- Call accepted by 10.0.101.1 (format ilbc)
    -- Format for call is ilbc
    -- Hungup 'IAX2/voip-gw-2'
  == Spawn extension (telefonos, 201, 1) exited non-zero on
'SIP/fozy-43bf'
    -- IAX2/voip-gw-4 answered SIP/fozy-dfbc
Jul 15 02:54:31 WARNING[28298]: chan_sip.c:1047 retrans_pkt: Maximum retries
exceeded on call 7b8a6c04cedf5549@192.168.1.6 for seqno 35151 (Non-critical
Response)
    -- Hungup 'IAX2/voip-gw-4'

localhost*CLI> show channels
        Channel  (Context    Extension    Pri )   State Appl.         Data
 IAX2/voip-gw-3  (           s            1   )      Up Bridged Call
SIP/fozy-e977
  SIP/fozy-e977  (telefonos  7205         1   )      Up Dial
IAX2/voip-gw/7205|60|mwtWT
 IAX2/voip-gw-5  (           s            1   )      Up Bridged Call
SIP/fozy-edd8
  SIP/fozy-edd8  (telefonos  7205         1   )      Up Dial
IAX2/voip-gw/7205|60|mwtWT

And on the other side

voip*CLI> show channels
        Channel  (Context    Extension    Pri )   State Appl.         Data
IAX2/fozy@fozy-gw-1  (telefonos  7205         3   )      Up Echo
(Empty)
IAX2/fozy@fozy-gw-6  (telefonos  7205         3   )      Up Echo
(Empty)
2 active channel(s)
2 active call(s)

Why is it trying to make several channels for the same call? Also, seems is
trying to bridge the call which I don't want since I need the asterisks to
stay in the middle since both asterisks are behind nats but they are
connected using openvpn.

Any clues that might help?