[SIPForum-discussion] How many SIP clients can be behind NAT

[Eric Burger]

Do not forget that an IP address can have at most 65535 ports  
associated with it. This sounds like a big number, but remember that  
if we are speaking of a NAT, then applications like Google Earth  
easily take up 10 ports per user, which means the number of ports  
available quickly drop to zero in any kind of carrier or large  
enterprise deployment.

On May 31, 2009, at 2:41 AM, Mario Christopher Avila Rosas wrote:

> Hi:
>
> All SBCs  should work as Firewalls protecting private SIP/IMS  
> networks. SBCs from some vendors support several security functions .
> The main functionality of an SBC (acting either as ABG or NBG) is to  
> protect youre core network, NAT sip requests, and many others.
> You can send media traffic from the UA-a to the  SBC and then  from  
> the SBC to UA-b. This is called media  anchoring. This can be disabled
> and the media traffic will take place directly from/to UA-a to/from  
> UA-b. All depends on your needs.
>
> ///Mario Christopher
>
> WILLIAM SANDOVAL GARZÓN wrote:
>>
>> Hi all
>>
>> Someone help me, i need to know  if the SBC works like a firewall.  
>> we would like send media traffic through internet and need security  
>> for my network
>>
>>
>> bs
>>
>> William
>>
>>
>> 2009/5/27 abhishek kapoor <kapoorabhishek at gmail.com>
>> Hi,
>>
>> Is there any limit on number of SIP clients which can be behind  
>> single NAT?
>>
>> Actually we need to set in SBC, maximum number of untrusted users
>> allowed before entire NAT device is demoted.
>>
>> With regards
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>
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