[cisco-voip] NAT for Call Managers

[Ahmed Elnagar]

NAT have a lot of problems one of them that I faced myself that the phones show as register on CUCM but actually they are not…try to avoid it as much as you can…however if it is mandatory choose the device that is making NAT for VOIP traffic VOIP aware in order to rewrite the NATted packet in the correct way that is suitable for RTP.

 

 Best Regards;

  Ahmed Elnagar

  Senior Network PS Engineer

  Mob: +2019-0016211

  CCIE#24697 (Voice)

  

 

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of john_burk at oxy.com
Sent: Friday, September 24, 2010 4:57 PM
To: humayun_sami at hotmail.com; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] NAT for Call Managers

 

NAT can cause havoc with the RTP stream, but with the right firewall and design/config it can be made to work. I use VPN if at all possible to avoid these issues.

John Burk, Consultant 
Sent from my Blackberry

 

________________________________

From: cisco-voip-bounces at puck.nether.net <cisco-voip-bounces at puck.nether.net> 
To: cisco-voip at puck.nether.net <cisco-voip at puck.nether.net> 
Sent: Fri Sep 24 08:02:38 2010
Subject: [cisco-voip] NAT for Call Managers 

Is it recommended to use NAT on VoIP. I have two separate cluster one for cisco call manager and other for Avaya. We are integrating both the setups(h323). Is it okay to use NAT. Can someone provide me a document which helps in this reference.


For what reason people do not recommend it in the network, or is it the same that you do not register your call managers with the domain server. Look forward to hear.



Regards,
Humayun Sami.

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