[Asterisk-Users] ShoreTel 210 MGCP phone drops calls with MGCP RSIP

[Ben Dugdale]

I've got a ShoreTel 210 MGCP phone drops calls.  My packet
capture indicates that the phone may be trying to renew its registration
with *, but reports Restart Method of Disconnected (frame 2), then *
seems to take that as a sign that it has lost the connection and closes
things down.  The phone, meanwhile, seems to think it can continue the
conversation until a few ICMP "port unreachable" packets set it straight.

I am able to duplicate this on a fairly regular basis and it appears
that the call is always dropped similarly.  Everything is groovy until
the first MGCP RSIP during a call.  The phone seems to send these MGCP
RSIPs (perhaps on a schedule, looks like every 120 seconds) even when
there is no call taking place.

Is my diagnosis correct?  What can I do about it?

...Normal RTP, then one final RTP packet and the following...

  1   0.000000  192.168.0.5 5004 192.168.1.137 5004 UDP Source port:
5004  Destination port: 5004
  2   0.007970 192.168.1.137 2427 192.168.0.5  2727 MGCP RSIP 14831
SHOR_001049007E83@[192.168.1.137] MGCP 1.0
  3   0.008096  192.168.0.5 2727 192.168.1.137 2427 MGCP 200 14831 OK
  4   0.008150  192.168.0.5 2727 192.168.1.137 2427 MGCP RQNT 7
SHOR_001049007E83@[192.168.1.137] MGCP 1.0
  5   0.008186  192.168.0.5 2727 192.168.1.137 2427 MGCP AUEP 8
SHOR_001049007E83@[192.168.1.137] MGCP 1.0
  6   0.008267  192.168.0.5 2727 192.168.1.137 2427 MGCP DLCX 9
SHOR_001049007E83@[192.168.1.137] MGCP 1.0
  7   0.009226  192.168.0.5 4569 192.168.1.135 4569 IAX2 IAX, source
call# 2, timestamp 61056ms HANGUP
  8   0.012188 192.168.1.135 4569 192.168.0.5  4569 IAX2 IAX, source
call# 10281, timestamp 61056ms ACK
  9   0.015216 192.168.1.137 5004 192.168.0.5  5004 UDP Source port:
5004  Destination port: 5004
 10   0.015265  192.168.0.5  192.168.1.137  ICMP Destination unreachable
(Port unreachable)
 11   0.029923 192.168.1.137 2427 192.168.0.5  2727 MGCP 200 7 OK
 12   0.030090  192.168.0.5 2727 192.168.1.137 2427 MGCP RQNT 10
SHOR_001049007E83@[192.168.1.137] MGCP 1.0
 13   0.035268 192.168.1.137 5004 192.168.0.5  5004 UDP Source port:
5004  Destination port: 5004
 14   0.035306  192.168.0.5  192.168.1.137  ICMP Destination unreachable
(Port unreachable)
 15   0.050434 192.168.1.137 2427 192.168.0.5  2727 MGCP 200 8 OK
 16   0.055251 192.168.1.137 5004 192.168.0.5  5004 UDP Source port:
5004  Destination port: 5004
 17   0.055282  192.168.0.5  192.168.1.137  ICMP Destination unreachable
(Port unreachable)
 18   0.077638 192.168.1.137 2427 192.168.0.5  2727 MGCP 250 9
Connection was deleted
 19   0.100808 192.168.1.137 2427 192.168.0.5  2727 MGCP 200 10 OK

rtp.conf:

[general]
rtpstart=5004
rtpend=5005

mgcp.conf:

[general]
port = 2727
bindaddr = 0.0.0.0

[192.168.1.137]
host            = 192.168.1.137
context         = home
callerid        = "ShoreTel" <4368>
dtmfmode        = inband
accountcode     = 1000
amaflags        = billing
callwaiting     = no
callreturn      = no
cancallforward  = no
canreinvite     = no
transfer        = no
line => SHOR_001049007E83

-- 
Ben Dugdale <ben at apachecounty.net>


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