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Knowledge Base

TE30, can’t initiate a call using SIP.

Publication Date:  2015-12-30  |   Views:  483  |   Downloads:  0  |   Author:  s00453625  |   Document ID:  EKB1000093384


Issue Description

TE30 can’t initiate a call using SIP. And the sip server didn’t receive any invite message from the TE30.


Handling Process

Capture package from the TE30 side. It shows the TE30 has sent invite message out and due to no response for several times, stop trying.

So, it should be the network issue and the packet is blocked due to some resson. Check the MTU in the network with command “ping IP –l XX”. The result is as follows. The maximum data package can sent out is 1468 bytes. So, the network MTU should be 1468+28=1496 byes. bytes=1400  à reply successful bytes=1468  à reply successful

From size start from 1469 reply getting failed. bytes=1469  à reply fail bytes=1500  à reply fail


Change the MTU setting on the TE30 and set the value to be 1496. Then the issue is fixed.