I did some checking in the logs. It seems that the mwi
service is not responding to subscribe requests. The
following is a contiguous fragment from the sipxproxy.log.
It seems to keep sending subscription requests but no
reply.

I can't see which component actually handles MWI from the
services list. Netstat shows that port 5110 is open and a
TCP connection exists as shown here.

[root@sipxecs sipxpbx]# netstat -na |grep 5110
tcp        0      0 192.168.50.21:5110          0.0.0.0:*   
               LISTEN
tcp        0      0 192.168.50.21:5110         
192.168.50.21:58311         ESTABLISHED
tcp        0      0 192.168.50.21:58311        
192.168.50.21:5110          ESTABLISHED
udp        0      0 192.168.50.21:5110          0.0.0.0:*
[root@sipxecs sipxpbx]#

Hope this helps.

"2012-07-24T08:42:58.075089Z"
:35110:KERNEL:INFO:sipxecs.datamerge.local:AsynchMediaRelayR
equestSender-14:7fc925406700:SipXProxy:
"OsConnectionSocket::read[4] error or EOF on fd 15, errno =
115 Operation now in progress"
"2012-07-24T08:59:22.490131Z"
:37772:KERNEL:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9
245ca700:SipXProxy: "OsConnectionSocket::_[5] connected 71
to 192.168.50.21:5110"
"2012-07-24T08:59:22.490585Z"
:37773:SIP:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9245
ca700:SipXProxy: "SipClient[SipClientTcp-734]::_ created TCP
unshared socket 71: host '192.168.50.21' '192.168.50.21'
port 5110, local IP '192.168.50.21' port -1"
"2012-07-24T08:59:22.492010Z"
:37775:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-0fa134V7o608HckCTXfhV38kMQ
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bK7e49edd546D24D28
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=F396D4B2-408B28DD
To: <sip:mailto:201@192.168.50.21>
Cseq: 1 SUBSCRIBE
Call-Id: mailto:e170ca23-c6fd6586-789f2a11@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.5.0508
Accept-Language: en
Accept: application/simple-message-summary
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 08:59:22 GMT

--------------------END--------------------
"
"2012-07-24T08:59:22.520714Z"
:37785:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-0fa3RRnHzyjFpQi_bkraW`4_2A
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bK9e075c84EBD72B9F
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=F396D4B2-408B28DD
To: <sip:mailto:201@192.168.50.21>
Cseq: 2 SUBSCRIBE
Call-Id: mailto:e170ca23-c6fd6586-789f2a11@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.5.0508
Accept-Language: en
Accept: application/simple-message-summary
Authorization: Digest username=\"201/0004f21b87c5\",
realm=\"datamerge.local\",
nonce=\"40ef4521138d1c3310d99e74cb8701dc500e63ea\",
qop=auth, cnonce=\"uEdG1dBuSIcHjtm\", nc=00000001,
uri=\"sip:mailto:201@192.168.50.21\";,
response=\"c2fc75dedc23489ba17ee920e8026200\",
algorithm=MD5
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 08:59:22 GMT

--------------------END--------------------
"
"2012-07-24T09:21:10.759122Z"
:38719:KERNEL:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9
245ca700:SipXProxy: "OsConnectionSocket::_[5] connected 35
to 192.168.50.21:5110"
"2012-07-24T09:21:10.759482Z"
:38720:SIP:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9245
ca700:SipXProxy: "SipClient[SipClientTcp-752]::_ created TCP
unshared socket 35: host '192.168.50.21' '192.168.50.21'
port 5110, local IP '192.168.50.21' port -1"
"2012-07-24T09:21:10.760647Z"
:38722:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-1042ATDkiDIbbiIJWExAocZBbA
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bKe67f7565298BA7BA
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=2866A561-672D5016
To: <sip:mailto:201@192.168.50.21>
Cseq: 1 SUBSCRIBE
Call-Id: mailto:cd030c17-a7af01bc-698679e9@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.5.0508
Accept-Language: en
Accept: application/simple-message-summary
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 09:21:10 GMT

--------------------END--------------------
"
"2012-07-24T09:21:10.782603Z"
:38732:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-1044QLPlvbwufhY8PvZzs4eFPw
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bK5b0c47deDC75F0DB
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=2866A561-672D5016
To: <sip:mailto:201@192.168.50.21>
Cseq: 2 SUBSCRIBE
Call-Id: mailto:cd030c17-a7af01bc-698679e9@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.5.0508
Accept-Language: en
Accept: application/simple-message-summary
Authorization: Digest username=\"201/0004f21b87c5\",
realm=\"datamerge.local\",
nonce=\"b9191f5ae0a6194f9762b69aeaf78858500e6906\",
qop=auth, cnonce=\"t0L+kKrsxXMFPxr\", nc=00000001,
uri=\"sip:mailto:201@192.168.50.21\";,
response=\"3774cddd555ef8aee0c879871e638698\",
algorithm=MD5
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 09:21:10 GMT

--------------------END--------------------
"
"2012-07-24T09:39:08.836658Z"
:39125:KERNEL:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9
245ca700:SipXProxy: "OsConnectionSocket::_[5] connected 45
to 192.168.50.21:5110"
"2012-07-24T09:39:08.837050Z"
:39126:SIP:INFO:sipxecs.datamerge.local:SipRouter-13:7fc9245
ca700:SipXProxy: "SipClient[SipClientTcp-763]::_ created TCP
unshared socket 45: host '192.168.50.21' '192.168.50.21'
port 5110, local IP '192.168.50.21' port -1"
"2012-07-24T09:39:08.838655Z"
:39128:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-1076Hucp6HBMtt2svj2TVxV7WA
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bK702affc431ED829F
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=778E6BF0-6F38543B
To: <sip:mailto:201@192.168.50.21>
Cseq: 1 SUBSCRIBE
Call-Id: mailto:2545f316-9c15bb59-bce29958@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.6.0314
Accept-Language: en
Accept: application/simple-message-summary
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 09:39:08 GMT

--------------------END--------------------
"
"2012-07-24T09:39:08.859966Z"
:39138:OUTGOING:INFO:sipxecs.datamerge.local:SipRouter-13:7f
c9245ca700:SipXProxy: "SipUserAgent::sendTcp TCP SIP User
Agent sent message:
----Local Host:192.168.50.21---- Port: -1----
----Remote Host:192.168.50.21---- Port: 5110----
SUBSCRIBE sip:mailto:201@192.168.50.21 SIP/2.0
Record-Route: <sip:192.168.50.21:5060;lr>
Route: <sip:mwi.sipxecs.datamerge.local;transport=tcp;lr>
Via: SIP/2.0/TCP
192.168.50.21;branch=z9hG4bK-XX-1078DHytMKUKhS7pRK`7pAcc8Q
Via: SIP/2.0/UDP
192.168.56.151;branch=z9hG4bK5879c9c3C5BF0F0A
From: \"Mark Dutton\"
<sip:mailto:201@192.168.50.21>;tag=778E6BF0-6F38543B
To: <sip:mailto:201@192.168.50.21>
Cseq: 2 SUBSCRIBE
Call-Id: mailto:2545f316-9c15bb59-bce29958@192.168.56.151
Contact: <sip:mailto:201@192.168.56.151;x-sipX-nonat>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE,
SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: message-summary
User-Agent: PolycomSoundPointIP-SPIP_550-UA/3.2.6.0314
Accept-Language: en
Accept: application/simple-message-summary
Authorization: Digest username=\"201/0004f21b87c5\",
realm=\"datamerge.local\",
nonce=\"8a1be3bc105fc609e4480e6680829ec2500e6d3c\",
qop=auth, cnonce=\"7qEZKl21sNVSyKU\", nc=00000001,
uri=\"sip:mailto:201@192.168.50.21\";,
response=\"d70bafb029598e3bb790e475c69b309c\",
algorithm=MD5
Max-Forwards: 20
Expires: 3600
Content-Length: 0
Date: Tue, 24 Jul 2012 09:39:08 GMT

--------------------END--------------------


-- 
Regards

Mark Dutton

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