I have set up Kamailio 3.3 on Ubuntu machine.I created two user test 1 and test 2.

I could use Presence and also i was able to register to Kamailio server and exchange presence status with each other.

Details- I used TCP protocol . 

testing methods - Linphone, a sample application.

I am able to register succesfully with (TCP) on to kamailio server using Lin phone and sample application.

I am able to update presence status of the users.

Issue :

When i try to send messages between two users ( using TCP ) 

1. from Sample application, when i try to send message, i get 420 temporarily Unavailable error from server. 

2. from Lin phone 3.5.2, i was able to send messages ( sue TCP) but when the other user try to reply back , i get same error 

480 Temporarily Unavailable. error from server.

I want a support to understand why i get error while sending messages with TCP via Kamailio server.

I am able to succeesfully send and receive messages when i use UDP from my sample application and Lin phone.

regards

Sunil C