Ah, indeed the problem is that the other side does not support this.
I'd been assuming it was just a standard feature of all SIP clients -
thanks very much for pointing this out!

John G

On Tue, Apr 9, 2013 at 1:18 PM, Michael Jerris <m...@jerris.com> wrote:
> Do you have "replaces" in your supported string?  try  SIPTAG_SUPPORTED_STR 
> passing a string that includes replaces in nua_set_params or nua_create.  I 
> assume the othe sides your talking to support replaces too?
>
> On Apr 9, 2013, at 7:06 AM, John Graham <johngavingra...@googlemail.com> 
> wrote:
>
>> Hi there,
>>
>> I'm trying to use the Sofia-SIP library to perform an unattended call
>> transfer. E.g. If I'm A and in a call with B and C, I thought I could
>> transfer so that B and C are talking with something like:
>>
>>    sip_replaces_t *replaces = nua_handle_make_replace(nua_
>> handle_B, NULL, 0);
>>    nua_refer(nua_handle_B,
>>            SIPTAG_REFER_TO_STR(addr_C),
>>            SIPTAG_REPLACES(replaces),
>>            TAG_END());
>>
>> However, when I do this I immediately get a nua_r_refer/400/"Replaces
>> header not allowed", and no further action is taken.
>>
>> I'd appreciate it if someone could point out my error, or what I can
>> do to get around this.
>

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