[asterisk-users] Integrate a CPE with Asterisk in MGCP

[Adrien Lemoine]

Hello all,

I'm looking for some help to try to understand why my CPE doesn't work
good with Asterisk in MGCP.

Here is what I want to do :

- Register a TECOM AH4021 on Asterisk in MGCP with the following profile
in mgcp.Conf :

[general]
port = 2727
bindaddr = 10.95.20.1
disallow=all
allow=g729
allow=alaw

020202020202]
context=mgcp
host=dynamic
canreinvite=no
dtmfmode=rfc2833
nat=yes
threewaycalling=yes
transfer=yes     ; transfer requires threewaycalling=yes. Use FLASH to
transfer
callwaiting=yes  ; this might be a cause of trouble for ip10s
cancallforward=yes
line=aaln/1

- Place outgoing calls through a SIP PROXY : OK, but the call goes down
after some seconds :

    -- Executing Answer("MGCP/aaln/1 at 020202020202-1", "") in new stack
    -- MGCP mgcp_answer(MGCP/aaln/1 at 020202020202-1) on aaln/1 at 020202020202-1
    -- Executing Dial("MGCP/aaln/1 at 020202020202-1",
"SIP/mgcp-out/0xxxxxxxx") in new stack
    -- Called mgcp-out/0xxxxxxxxxx
Dec 17 18:34:47 NOTICE[17889]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
    -- SIP/mgcp-out-09d998c0 is making progress passing it to
MGCP/aaln/1 at 020202020202-1
Dec 17 18:34:48 WARNING[17932]: chan_mgcp.c:1375 mgcp_indicate: Don't know
how to indicate condition 14
    -- SIP/mgcp-out-09d998c0 answered MGCP/aaln/1 at 020202020202-1
    -- Attempting native bridge of MGCP/aaln/1 at 020202020202-1 and
SIP/mgcp-out-09d998c0
    -- Resetting interface aaln/1 at 020202020202
  == Spawn extension (mgcp, 0141909872, 2) exited non-zero on
'MGCP/aaln/1 at 020202020202-1'
    -- MGCP handle_request(aaln/1 at 020202020202-1) ast_channel already
destroyed, resending DLCX.
    -- MGCP handle_request(aaln/1 at 020202020202) set vmwi(-)

- Receive incoming calls through SIP PROXY : OK too, but as with the
outgoing calls, the interface seems to self restart :
   -- Executing Dial("SIP/XXXSIPCALLID", "MGCP/aaln/1 at 020202020202") in
new stack
    -- MGCP mgcp_request(aaln/1 at 020202020202)
    -- MGCP cw: -1, dnd: 0, so: 0, sno: 0
    -- MGCP mgcp_new(MGCP/aaln/1 at 020202020202-1) created in state: Down
    -- Called aaln/1 at 020202020202
    -- MGCP/aaln/1 at 020202020202-1 is ringing
    -- MGCP/aaln/1 at 020202020202-1 answered SIP/XXXSIPCALLID
    -- Attempting native bridge of SIP/XXXSIPCALLID and
MGCP/aaln/1 at 020202020202-1
Dec 17 18:38:33 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:34 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:35 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:36 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:38 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:41 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:44 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
Dec 17 18:38:47 NOTICE[17957]: chan_mgcp.c:1656 find_subchannel_and_lock:
Gateway '020202020202' (and thus its endpoint 'virtual/nat-timeout') does
not exist
    -- Resetting interface aaln/1 at 020202020202
  == Spawn extension (frommgcp, 0973009997, 1) exited non-zero on
'SIP/87.237.184.116-087f4fb0'
    -- MGCP handle_request(aaln/1 at 020202020202-1) ast_channel already
destroyed, resending DLCX.
    -- MGCP handle_request(aaln/1 at 020202020202) set vmwi(-)

I don't succeed in using g729 for incoming calls whereas its works with
outgoing calls. So the incoming calls negociate in ulaw only and the
callee side doesn't ear the caller.... I review my ip routes, it's okay
because I see the RTP in both way by running ethereal. I don't see what is
the problem. So ideally, Asterisk will be able to drive the codec
negociation for incoming calls, but I don't know how that is possible.

Asterisk 1.2.35 runs under Redhat Enterprise 4

To conclude, I don't understand the following logs :

chan_mgcp.c:1656 find_subchannel_and_lock: Gateway '020202020202' (and
thus its endpoint 'virtual/nat-timeout') does not exist

Thanks for your attention.
-- 
Adrien