asterisk users - Mar 2015 - RTP handling

Hello,

I am wondering if asterisk does anything at all to RTP packets passed 
from channel to channel if no transcoding is involved? Can I assume that 
the packet that left phone A, arrived at the asterisk server, was copied 
to phone B's channel and eventually arrived at phone B had exactly (byte 
for byte) the same payload?  Assume two SIP endpoints, no NAT involved.

Thanks,

j

On Tue, Mar 24, 2015 at 4:17 PM, Jeff LaCoursiere <jeff at jeff.net>
wrote:
>
> Hello,
>
> I am wondering if asterisk does anything at all to RTP packets passed from
> channel to channel if no transcoding is involved? Can I assume that the
> packet that left phone A, arrived at the asterisk server, was copied to
> phone B's channel and eventually arrived at phone B had exactly (byte
for
> byte) the same payload?  Assume two SIP endpoints, no NAT involved.
>
That will only happen when the call is natively bridged:

Non-native bridge: Packets can get translated or Asterisk has an interest
in the packet for things like DTMF or call recording.
Native bridge doing packet-to-packet (Local bridging): Packets come in on
one channel and go out the other channel with nothing else done to them.
Native bridge doing direct media (Remote bridging): Packets go directly
between endpoints so Asterisk never sees them.

Richard
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On 03/24/2015 04:28 PM, Richard Mudgett wrote:
>
>
> On Tue, Mar 24, 2015 at 4:17 PM, Jeff LaCoursiere <jeff at jeff.net 
> <mailto:jeff at jeff.net>> wrote:
>
>
>     Hello,
>
>     I am wondering if asterisk does anything at all to RTP packets
>     passed from channel to channel if no transcoding is involved? Can
>     I assume that the packet that left phone A, arrived at the
>     asterisk server, was copied to phone B's channel and eventually
>     arrived at phone B had exactly (byte for byte) the same payload? 
>     Assume two SIP endpoints, no NAT involved.
>
>
> That will only happen when the call is natively bridged:
>
> Non-native bridge: Packets can get translated or Asterisk has an 
> interest in the packet for things like DTMF or call recording.
> Native bridge doing packet-to-packet (Local bridging): Packets come in 
> on one channel and go out the other channel with nothing else done to 
> them.
> Native bridge doing direct media (Remote bridging): Packets go 
> directly between endpoints so Asterisk never sees them.
>
> Richard
>
Thanks for the quick reply RIchard!  Can I force native bridging, or 
does it default to that if I don't configure direct media?  The dialplan 
will be very simple - extensions calling extensions within a context.  
No DTMF, no recording, no mixing for conference, etc.

Cheers,

j

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