cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
Walkthrough Wednesdays
142
Views
2
Helpful
1
Replies
neilo
Beginner

INBOUND VCS-E CALLS DROPPING

Hi,

I have a VCS-C & VCS-E running software ver 7.2.2.  The VCS-E is located in a DMZ, we have just changed the IP Addresses on the VCS-E according to the Cisco documentation and with some assistance from Cisco TAC.  Ever since then, ALL external calls inbound land OK but when there is no video or audio and the call quickly drops.

We have changed any static routes in place, along with the default gateway etc...  Firewall rules have all been checked, changed and double checked.

Can anyone answer a couple of questions for me:

 

Any ideas around why only Inbound calls are affected - outbound calls work fine.

When a call is active between an internal endpoint and an external caller via the VCS-E, does the endpoint talk directly to the VCS-E or does the VCS-C manage this?

 

Regards

Neil

1 REPLY 1
Acevirgil de Ocampo
Rising star

This kind of issue most likely incoming traffic were being blocked by firewall. Check if ALG is enabled for SIP and H323 inspections on firewall. This should be disabled and would cause packets to be dropped. Verify also  if firewall ports were defined well as per VCS ports usage: 

http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/Cisco_VCS_IP_Port_Usage_for_Firewall_Traversal_Deployment_Guide_X7-2.pdf

Do you encounter same issue for any type of incoming call?

  • SIP incoming call
  • H323 incoming call

 

What type of endpoints involved in the call?

 

How is your VCS-E deployed on DMZ? 

  • Dual NIC with NAT
  • Single NIC with NAT

 

When a call is active between an internal endpoint and an external caller via the VCS-E, does the endpoint talk directly to the VCS-E or does the VCS-C manage this?

  • During traversal calls, VCS Control is always a part of the call flow.

regards,

Acevirgil

 

Content for Community-Ad

Spotlight Awards 2021