Hi there again

,
Now i am having trouble with agents being logged out from Sip Server. According to log, it seems that the cause is the DN unregistering in sip server.
I already configured the phones keep alive every 30 seconds using sip options type, and in log i can see the OK from sip server.
Thatīs part of the log. Is there any other configuration i should check to avoid this dn unregister with sip server?
14:30:57.080: Sending [0,UDP] 405 bytes to 10.74.26.58:5062 >>>>>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.74.26.58:5062;branch=z9hG4bK836948041;received=10.74.26.58
From: "1105072058" <sip:1105072058@172.19.132.158>;tag=518107016
To: "1105072058" <sip:1105072058@172.19.132.158>;tag=488F32FC-4D23-4F52-9B03-559785AAE3E8-3800522
Call-ID: 1023564669@10.74.26.58
CSeq: 1 REGISTER
Expires: 3600
Contact: <sip:1105072058@10.74.26.58:5062>;expires=3600
Content-Length: 0
14:30:57.080: $-NET:SIP::0:58
14:30:57.080 Trc 04524 Client anonymousTServerClient disconnected on [12052], id=00004c09
14:30:57.080: client disconnected
14:30:57.080: SipTServerDevice::ClientFarewell:SessionID(0x894557):LoggedInSessionID(0x894557)
14:30:57.080: SipTServerDevice::ClientFarewell:SessionID(0x894557): FORCE LOGOUT
14:30:57.080 -- created: CRequest@be119a0 RequestAgentLogout-internal
14:30:57.080: $+TLIB:CTI:Unknown:0:211119
14:30:57.080 +++ CIFace::Request +++
-- new invoke
Parsed: RequestAgentLogout
**internal**
Numbers: +<1100073217> -<none>
Status: parsed:1 queued:0 sent:0 acked:0 preevent:0 event:0 context:0 transferred:0
-----
14:30:57.080: AgentLogut: forced while position is in the call
@14:30:57.0800 [0] 8.1.101.50 distribute_event: message EventAgentLogout
AttributeExtensions [74] 00 02 00 00..
'EmulateLogin' 'true'
'AgentSessionID' 'NCTGUC5Q8H67924GEJKUMR538G09CHIF'
AttributeEventSequenceNumber 0000000002dc815d
AttributeTimeinuSecs 80000
AttributeTimeinSecs 1422462657 (14:30:57)
AttributeAgentID '1100010117'
AttributeThisDN '1100073217'
14:30:57.080: Agent logged off
14:30:57.080: DelImplicitMwiAgentsLoginTables dn:1100073217 mailbox:
14:30:57.080: MWIMNGR:STOP: DN="1100073217", Type=2 - not monitored
-- AgnDevData: synchronising agent state 0xb00 for 1100073217
-- AgnDevData: synchronising previous state 0x2
-- AgnDevData: synchronising previous reason code: NULL
-- AgnDevData: synchronising not-ready workmode 0
@14:30:57.0800 [BSYNC] Trace: Sent
-- emulated by AgentEmulator
FinishRequest CRequest@be119a0 RequestAgentLogout-internal
IFace stats: q=0 s=0
-- complete
14:30:57.080 --- CIFace::Request ---
14:30:57.080: IFACE:REQ:AGENTLOGOUT:SESSION_ID(0x0)
14:30:57.080 -- deleted: CRequest@be119a0 RequestAgentLogout-internal
14:30:57.080: $-TLIB:CTI:Unknown:0:756
14:30:57.080 TRegManager::ClientUnregistered 19465 1100073217
14:30:57.080 TRegManager::ClientDisconnected 19465
@14:30:57.0800 [ISCC] CLUSTER_NODE_ROUTE_DESTINATION_STRATEGY: location removed: (anonymousTServerClient:00004c09@)
@14:30:57.0800 [ISCC] Location anonymousTServerClient:00004c09@/0 is removed
@14:30:57.0800 [ISCC] (location-removed-object anonymousTServerClient:00004c09@)
thanks in advance !