[asterisk-dev] IAX hardphone

Bill Shaw b.shaw at comcast.net
Mon Feb 14 15:39:12 CST 2011

Yes,  this is very interesting.  Ethereal shows a udp checksum error,  
Wireshark says the udp checksum is disabled.  I'm using the Microchip 
Stand Alone Etherent Controller's DMA engine to calculate the IP and UDP 
checksums,  IP's OK,  UDP is wrong.   Very interesting.

Thanks again,


On 2/14/2011 4:04 PM, Kevin P. Fleming wrote:
> On 02/14/2011 02:52 PM, Mihai Balea wrote:
>> On Feb 14, 2011, at 3:44 PM, Bill Shaw wrote:
>>> http://b.shaw.home.comcast.net/accept.pcap
>> One thing i noticed is that UDP packets sent by your DSP device have
>> incorrect checksums. Maybe that has something to do with your problem...
> That is very likely the problem; the UDP packet is never being seen by 
> Asterisk at all. This can be tested by setting 'nochecksums = yes' in 
> the general section of iax.conf.

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