asterisk users - Oct 2004 - Cisco ATA-188 w/502 Error on CallWaiting

I have a Cisco ATA-188 with two POTS phones and latest stable cvs.  In any
situations with call waiting (existing connection and calling again) the
second call cause both calls to drop.  This is the same for "internal"
extensions and from external (ZAP and SIP).  It seems to be a "502 - The
transaction could not be executed, because the endpoint does not have
sufficient resources" (message from log guide).  Actual asterisk message is
"502 43 CAN'T ALLOCATE CONNECTION"

I've attached logs from Asterisk and the mgcp Cisco log.  Any ideas? 

Has anyone see problems with Call Waiting and MGCP?  Any ideas where to look
would be a great help!

Thanks,
Phil


++++++++++++++++++++++++++++++++++++++++
LOG FROM "MGCP DEBUG"
++++++++++++++++++++++++++++++++++++++++

v=0
o=root 2272 2272 IN IP4 192.168.1.30
s=session
c=IN IP4 192.168.1.30
t=0 0
m=audio 26040 RTP/AVP 0
a=rtpmap:0 PCMU/8000
 to 192.168.1.31:2427
    -- Modified aaln/2@atagw-1 with new mode: recvonly on callid:
770afbb9257130a3
Posting Request:
MDCX 44 aaln/2@atagw MGCP 1.0
C: 770afbb9257130a3
M: recvonly
X: 257130a3
I: 3
R: L/hu(N),L/hf(N),D/[0-9#*](N)
 to 192.168.1.31:2427
    -- MGCP Asked to indicate tone: L/wt,L/ci(10/04/21/07,110,SoftPhone) on
aaln/2@atagw-0 in cxmode: recvonly
Posting Request:
RQNT 45 aaln/2@atagw MGCP 1.0
X: 3f2dba31
R: L/hu(N),L/hf(N),D/[0-9#*](N)
S: L/wt,L/ci(10/04/21/07,110,SoftPhone)
 to 192.168.1.31:2427
    -- Modified aaln/2@atagw-1 with new mode: sendrecv on callid:
770afbb9257130a3
Queueing Request:
MDCX 46 aaln/2@atagw MGCP 1.0
C: 770afbb9257130a3
M: sendrecv
X: 257130a3
I: 3
R: L/hu(N),L/hf(N),D/[0-9#*](N)
 to 192.168.1.31:2427
MGCP read: I> 
502 43 CAN'T ALLOCATE CONNECTION

MGCP read: 8.1.31:2427
502 43 CAN'T ALLOCATE CONNECTION

from 192.168.1.31:2427Verb: '502', Identifier: '43', Endpoint:
'CAN'T',
Version: 'ALLOCATE CONNECTION'
1 headers, 0 lines
Oct  4 21:07:24 NOTICE[1087695664]: chan_mgcp.c:2282 handle_response:
Terminating on result 502 from aaln/2@atagw-0
    -- Called aaln/2@atagw
    -- MGCP mgcp_hangup(MGCP/aaln/2@atagw-0) on aaln/2@atagw
    -- MGCP Asked to indicate tone: L/v on  aaln/2@atagw-0 in cxmode:
recvonly
Queueing Request:
RQNT 47 aaln/2@atagw MGCP 1.0
X: 3f2dba31
R: L/hu(N),L/hf(N),D/[0-9#*](N)
S: L/v
 to 192.168.1.31:2427
  


++++++++++++++++++++++++++++++++++++++++
LOG FROM CISCO ATA-188
++++++++++++++++++++++++++++++++++++++++

CA[c0a8011e:2427]->Msg
RQNT 25 aaln/2@atagw MGCP 1.0
X: 3f2dba31
R: L/hu(N),L/hf(N),D/[0-9#*](N)

Msg->CA[c0a8011e:2427]
200 25 OK

CA[c0a8011e:2427]->Msg
CRCX 26 aaln/2@atagw MGCP 1.0
C: 1e3c1dd17c83e458
L: p:20, a:PCMU
M: recvonly
X: 7c83e458

v=0
o=root 2272 2272 IN IP4 192.168.1.30
s=session
c=IN IP4 192.168.1.30
t=0 0
m=audio 8138 RTP/AVP 0
a=rtpmap:0 PCMU/8000

Msg->CA[c0a8011e:2427]
502 26 CAN'T ALLOCATE CONNECTION