for the first call I'm getting response with details as shown bellow:
tarting REST web service operation [Login]
15/01/2016 08:04:46:640 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using Basic/Digest authentication for web service call
15/01/2016 08:04:46:645 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Web Service Request ->
https://secure-slsomxvja.crmondemand.com/OnDemand/user/Rest/Connection
15/01/2016 08:04:49:738 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Response had content type: application/vnd.oracle.adf.resource+json. Retrying call with new type...
15/01/2016 08:04:50:618 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Storing [{"Connection":{"apiVersion":"028","apiVersionMinimum":"026","clientHelpURL":"https://support.oracle.com/epmos/faces/DocumentDisplay?id=1663390.1","dateFormatLocale":"yyyy-MM-dd, yyyy-MM-dd'T'HH:mm:ss'Z'","languageLocale":"ENU","maximumFileSize":20,"Version":"029.015.002","ServerDate":"2016-01-14T23:04:52Z","LastLoggedIn":"2016-01-14T23:04:51Z","UserLoginId":"VERIFI/CTI","UserId":"AVJA-DJNW7W","TenantId":"AVIA-4TU2Z3","CompanyName":"Teva Verifi"}}] to: restReponse
15/01/2016 08:04:50:618 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Web Service Reply <- {"Connection":{"apiVersion":"028","apiVersionMinimum":"026","clientHelpURL":"https://support.oracle.com/epmos/faces/DocumentDisplay?id=1663390.1","dateFormatLocale":"yyyy-MM-dd, yyyy-MM-dd'T'HH:mm:ss'Z'","languageLocale":"ENU","maximumFileSize":20,"Version":"029.015.002","ServerDate":"2016-01-14T23:04:52Z","LastLoggedIn":"2016-01-14T23:04:51Z","UserLoginId":"VERIFI/CTI","UserId":"AVJA-DJNW7W","TenantId":"AVIA-4TU2Z3","CompanyName":"Teva Verifi"}}
15/01/2016 08:04:50:633 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using SCESession B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL servlet : GetURL
15/01/2016 08:04:50:770 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Starting REST web service operation [GetURL]
15/01/2016 08:04:50:819 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using Basic/Digest authentication for web service call
15/01/2016 08:04:50:819 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Web Service Request ->
https://secure-slsomxvja.crmondemand.com/OnDemand/user/Rest/latest/Contacts?fields=CustomText0&q=IndexedShortText0='035821800'
15/01/2016 08:04:52:027 ERROR - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : HTTP TRANSPORT, 403 ERROR: FORBIDDEN
15/01/2016 08:04:52:027 ERROR - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : EXCEPTION: Transport error: 403 Error: Forbidden
15/01/2016 08:04:52:034 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Capturing exception [org.apache.axis2.AxisFault]. Message [Transport error: 403 Error: Forbidden]
15/01/2016 08:04:52:034 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using SCESession B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL servlet : logoff
15/01/2016 08:04:52:112 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Starting REST web service operation [Logoff]
15/01/2016 08:04:52:143 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using Basic/Digest authentication for web service call
15/01/2016 08:04:52:143 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Web Service Request ->
https://secure-slsomxvja.crmondemand.com/OnDemand/user/Rest/Connection?action=logoff
15/01/2016 08:04:53:038 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Response had content type: text/plain. Retrying call with new type...
15/01/2016 08:04:53:270 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Storing [] to: restReponse
15/01/2016 08:04:53:270 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Web Service Reply <-
15/01/2016 08:04:53:270 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Using SCESession B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL servlet : endScript
16/01/2016 19:19:34:087 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : HTTP Session lost removing SCESession B0AC7D4242152862EE47D7166DA139FB
16/01/2016 19:19:34:999 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : SCESession Removed
16/01/2016 19:19:34:999 DEBUG - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : Removing 1 session stack frames.
16/01/2016 19:19:34:999 INFO - B0AC7D4242152862EE47D7166DA139FB:/getCRM_URL : ** Popped Stack Frame [/getCRM_URL]
from what I understand the session need to be open after connecting by the first rest call.