Unable to connect to Sip server

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What steps will reproduce the problem?
1. Created Sip accounts using Sip2sip.
2.Placed those details in testRegistration.
3.And tried to run the code.
4.We are unable to connect to Sip server.

What is the expected output? What do you see instead?

Sip connection should be established. But we are getting below error

*INFO: State machine: tsip_transac_nict_Trying_2_Trying_X_timerE
*INFO: 

SEND: REGISTER sip:sip2sip.info SIP/2.0
Via: SIP/2.0/UDP 172.20.221.189:53710;branch=z9hG4bK-1705389418;rport
From: <sip:xxxxx@sip2sip.info>;tag=1759041284
To: <sip:xxxxx@sip2sip.info>
Contact: 
<sip:xxxxx@172.20.221.189:53710;transport=udp>;expires=3200;+g.oma.sip-im;langua
ge="en,fr";+g.3gpp.smsip;+g.oma.sip-im.large-message;audio;+g.3gpp.icsi-ref="urn
%3Aurn-7%3A3gpp-application.ims.iari.gsma-vs";+g.3gpp.cs-voice
Call-ID: 4cbf4525-2c61-99b2-7145-dfcebfbfc23c
CSeq: 702852548 REGISTER
Content-Length: 0
Max-Forwards: 70
Authorization: Digest 
username="xxxxx,realm="sip2sip.info",nonce="",uri="sip:sip2sip.info",response=""
Allow: INVITE, ACK, CANCEL, BYE, MESSAGE, OPTIONS, NOTIFY, PRACK, UPDATE, REFER
Privacy: none
P-Access-Network-Info: ADSL;utran-cell-id-3gpp=00000000
User-Agent: IM-client/OMA1.0 ios-ngn-stack/v00 (doubango r000)
P-Preferred-Identity: <sip:xxxxx@sip2sip.info>
Supported: path

*INFO: State machine: tsip_transac_nict_Trying_2_Terminated_X_timerF
*INFO: State machine: tsip_dialog_register_Any_2_Terminated_X_transportError
*INFO: === REGISTER Dialog terminated ===
*INFO: OnDialogEvent(Transport error., 1)
*INFO: OnDialogEvent(Dialog terminated, 1)
*INFO: === NICT terminated ===
*INFO: *** REGISTER Dialog destroyed ***
*INFO: *** NICT destroyed ***
*INFO: *** SIP Session destroyed ***

What version of the product or source code revision are you using? On what
operating system?

We are using iDoubs v2.x o for iPhone on MAC

Please provide any additional information below.
Original issue reported on code.google.com by sujitha....@gmail.com on 9 Jan 2014 at 1:33
mydecember / idoubs

Unable to connect to Sip server #167
