[cisco-voip] Voip NAT Traversal with CCM

[Lelio Fulgenzi]

I too wish there was a simple solution to this. A SCCP proxy would be great.
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Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
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"I had a coffee and Coke at lunch today...and now, I've got more jitter than an
IP phone on a long haul 10base2 connection"                                           LFJ
  ----- Original Message ----- 
  From: Voll, Scott 
  To: Justin Steinberg ; cisco-voip at puck.nether.net 
  Sent: Thursday, January 05, 2006 11:30 AM
  Subject: RE: [cisco-voip] Voip NAT Traversal with CCM


  Justin--

  I feel your pain.  We have just gone through the same process.  We have
  went to using 836 DSL routers because we couldn't get those cheap
  actiontec things working.  

  Scott

  -----Original Message-----  Justin Steinberg


  I'm getting more and more requests for telecommuters who wish to have
  an IP phone at their residence.  For ease of management I would prefer
  to just give the remote users an IP Phone and configure the phone with
  alternate TFTP to contact a public IP address of a CCM tftp server. 
  Of course the CCM would have to be firewalled appropriately.

  The problem is that most of these users will plug their IP phone into
  a cheap dsl/cable NAT router which will lead to the problem of no way
  / one way voice. The  signalling will communicate with callmanager and
  the audio with a voice gateway or another IP phone.   Thus with the
  phone behind a "dumb" NAT router this solution won't work.

  Is there any solution that will get the job done without requiring any
  hardware on the end user side?  Any solution that requires purchasing
  a 79xx phone and a VPN capable router isn't going to fly.  The
  hardware costs and maintenance support required will not realize a
  cost savings over a PSTN line.

  I know SIP has session border controllers but I'd rather not have to
  worry about what phones are running SIP and what phones running SCCP.

  Are there any Session Border Controllers for SCCP or any other way to
  get past this NAT issue?

  I've read a little about IOS NAT Application Layer Gateways but I'm
  not an expert in that area.

  What are other people doing?

  Thanks

  Justin

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