B2B Calls

[Leonardo Santana]

Hello,

When i call from my internal telepresence endpoint to a endpoint at the internet, i see some disconnection at the firewall of the destination endpoint

The firewall is dropping the connection 

4 Jan 10 2018     10:41:39 419001              EXPRESSWAY E PUBLIC IP  25156    ENDPOINT AT THE INTERNET  5060      Dropping TCP packet from outside:EXPRESSWAY E PUBLIC IP/25156 to inside:ENDPOINT AT THE INTERNET/5060, reason: MSS exceeded, MSS 1430, data 1439

Why the MSS

Problem Description

+++++++++++++++++

>> IP address dialling via CUCM.

>> Call not connecting.

Call Flow:

SX80 -> CUCM -> EXPRESSWAY C -> EXPRESSWAY E -> EXTERNAL ENDPOINT (SX20)

Product

++++++++

CUCM 11.5.1.13032-4

Cisco TelePresence SX80 ce 8.2.2 Final 3263c59 2016-09-26

Expressway C X8.9.1

Expressway E X8.9.1

Regards

Leonardo Santana

[Elias Sevilla Duarte]

Ok, I thought I had replied to this post a couple of days ago, but apparently my reply did not save or something.

The most likely cause of the issue could be the one mentioned in the below support link.

http://www.jklogic.net/blog/mss-exceeded-workaround

HTH.

[fahad ck]

Dear Elias

Unfortunately the link you have given as not available 

could you please share the link or the details again 

[Elias Sevilla Duarte]

Hi,

This one may help.

http://networkfailure.blogspot.com/2010/01/mss-exceeded-workaround.html

/Elias