[VoiceOps] Issues with ISPs blocking SIP 5060 - 5061

Matt Yaklin myaklin at g4.net
Thu Nov 21 12:55:11 EST 2013

On Thu, 21 Nov 2013, J. Oquendo wrote:

> On Thu, 21 Nov 2013, Matt Yaklin wrote:
>> Will tunneling the sip/rtp packets be more common in the near future
>> for SIP phone providers?
>> matt
>> From the ITSP side (where we provide trunks). Tunnels would
> be a nightmare, so they are a no-no. Now you're throwing
> in too many variables (Aggressive, Main, set ups, different
> equipment). Not to mention the overhead it would add to an
> SBC.
>> From the Managed PBX side of the equation... NO, but before
> I ramble on, define tunneling. Tunneling as in VPN? If the

Yes, a VPN tunnel that the CPE/SBC would have to handle
and connect back to a centralized location that the SIP
provider controls. Every SIP device behind the CPE/SBC would
have to go through the CPE/SBC.

The reason I mention it was recent SBC installs I did at
customer sites had tunnel options but I am unsure at the moment
if it was for site to site (full mesh setup) connectivity for
security reasons or more for getting back to the provider
for alternative reasons.

But the more I think about it... it does add complexity
that we would all like to avoid.


> concern is security, TLS is suitable from the managed PBX
> side as we can firewall trusted CIDRs on the firewall to
> prevent recording/tampering.
> If you meant VPN tunneling... Would only work on a softphone
> because I have YET to see any VoIP device (phone, ATA, FXO,
> FXS) have any parameters to set up a tunnel. So I am unsure
> how one would truly call a VoIP Tunnel in a VPN sense, any
> kind of true tunneling. (Tunnel in Tunnel maybe, been a
> while since I dove into CCIP/IE like material.
> -- 
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> J. Oquendo
> "Where ignorance is our master, there is no possibility of
> real peace" - Dalai Lama
> 42B0 5A53 6505 6638 44BB  3943 2BF7 D83F 210A 95AF
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