Re: [Sip] SIPS over NAT and Firewalls

Hi Pavan,

Not sure abt the 1st part of ur questions...but regarding point 2 I have
some suggestions:
1) Not sure what you mean by how to transport ??....but here I assume that u
r concerned about how the packets will be seen in the REAL world. There are
several options
a) Clients can have STUN support, which will make clients transparent of any
NAT traversal
b) Proxies can be sip-outbound-draft compliant...this will take care of
routing based on actuall src IP:Port overriding 3261 based approach (routing
request based on Contact/Route hdr etc ..).
c) Your network can have a ALG , just outside NAT box.....this ALG needs to
be SIP aware and should do all the header re-writings. Unfortunately no
standard exists as such ..but some googling may help

rgds
  Hul

On Wed, Feb 27, 2008 at 3:33 PM, PAVAN KUMAR O <acdcpavan@gmail.com> wrote:

> Hi all,
>
>        I am Pavan.I am working on implementing security features for SIP
> on a Voip enabled phone.\
> 1) I am bit confused with the implementation of "sips" scheme and the
> necessary changes to be made in the sip headers to make them comply with
> sips scheme.
> 2) How to transport sip/sips messages over NAT or Firewall??
>
> Any help in this regard will be greatly appreciated.
>
> Thanks & Regards
> Pavan Kumar O
> M.E Embedded Systems
> BITS Pilani
> India
>
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