[asterisk-users] SIP Port 5060

[Leo Ann Boon]

Brad Templeton wrote:
<snip>
> My understanding was that the "port=" field on a particular SIP
> channel defines the port used at the remote end, ie. The 
> user's phone will be talking on port X of their IP address, it
> does not alter what SIP port Asterisk is listening on on the
> Asterisk box.
>   
The host and port pair is used by Asterisk to identify a static peer. If 
host=dynamic, then Asterisk will use the host/port from the Register 
message.
> That is what bindport does, and that's a global setting, I
> was not aware you could have multiple bindports but that is
> very useful if it works.
>   
1.2 certainly doesn't support the use multiple ports. If you put 
bindport=5060;6060, only 5060 is use.

<snip>
>     a) You might get around carrier SIP blocking
>   
If the carrier is really determined to block you, they will use content 
inspection rather than just blocking by port number.

The only viable solution is by VPN or SIP encryption. I know there are 
various proxies that support hash encryption of SIP/RTP packets to get 
around the blocking. The only problem is finding equipment that support 
the hash encryption which is vendor specific.

IIRC, opensipstack has a working implementation of such an encryption 
scheme.


Leo