Calling a group of phones and force the speaker

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>
> On Wed, Feb 8, 2012 at 12:48 PM, Danny Dias wrote:
>
>> Hi,
>>
>> I wonder, if there is a way to call from A phone to a group of phones (B,
>> C and D) and force these phones to activate automatically the speaker
>>
>> Is that possible?
>>
>> Many thanks in advance
>>
>>
I’ve done this quite a few times with Polycom phones and the SipAddHeader()
application in Asterisk. There’s plenty of guides out there with details
on how to do this.