You are having a NAT related issue, what router is doing the NAT, is UPNP enabled in the router? What ports are forwarded to the Freeswitch?

Thanks,

Moishe Grunstein

Tornado Computer Systems, Inc.

212.400.7650 888.IPPBX.US
Service Request Email: support@nysolutions.com

Polycom Certified VAR
Microsoft Small Business Specialist, Cisco SMB Select Certified

Computer Networking * Managed Services * IP Video Surveillance * Network Assessments * Web Solutions * Voice over IP * Disaster Recovery * Network Security * Site Surveys * CMS

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Nguy?n Van Nghia Em
Sent: Wednesday, July 09, 2014 12:38 AM
To: freeswitch-users@lists.freeswitch.org
Subject: [Freeswitch-users] Cannot heard sound on FS

Dear All,

I have a FS production deployment:

- A FS server behind a NAT network

- User can register and make calls via internet.

It have worked well more than 2 years, but it took problem now:

Assume I have following cases:

1. Phone number in PSTN call to Extension in my branch

2. Extensions from another branch call to Extension in my branch (via sip trunk)

3. An extension in my branch call to another extension in my branch

4. An extension in my branch call to a phone number in PSTN 

5. An extension in my branch call to a an extension in another branch  (via sip trunk)

These are results:

Cases 1. 2. and 3.: Caller heard well but sometime Calleed can't heard from caller. If i wait for a longer time (may be 1 minutes, 2 minutes...) Calleed might heard from Caller.

Cases 4.5: Both Caller and Calleed heard well.

I have captured PCAP file on FS server, I saw that there were no different between cases 1,2,3 and case 4,5. I have seen many packets that FS server send to calleed IP.

There are only one change to my branch network. Network administrator make a NAT (80 and 8000)  for camera service at public interface to a private IP  in my branch network.

My question is: why Calleed in case 1, 2, 3 can not heard from caller ?

Another question: FS use RTP for carrying out voice/video but I can only see about 11 RTP packets (for one direction), but there are too many UDP packets in call session. I have attached the picture for that.

In the picture:

113.161.90.103: public ip address in my branch

192.168.45.4: FS server private ip behind NAT

10.12.10.140: My AudioCodes Phone's private IP in my branch 

Thanks in advance for your help.

--
Best regards,
-------------------------------------------------------------------------------------------------------------
EM NGUYEN

Website: http://freeswitch.vn
Mobile: +84 949669075
Yahoo & Skype: nghiaembt
--------------------------------------------------------------------------------------------------------------