[Asterisk-Users] Softphone - Freeware?!

[Nicolas]

Eric Bart wrote:

>Thanks
>
>I don't understand why sipura can do consultative transfer
>and why grandstream can't. They're both SIP, aren't they ?
>
>  
>
They use different sip stacks... and yes, they are both sip. Try to mix 
in the same environment sipuras, grandstreams, snoms, uniden, saysons, 
cisco, asterisk, etc. and you will notice that SIP is not the same thing 
for every vendor. Sipura sip stack is rock solid and very compatible 
with other vendors. Grandstreams sip implementation is flacky, you will 
have a crashed phone every now and then. Some versions of snom firmaware 
work better with asterisk than others. SIP devices have a life on their 
own..:)

Nicolas