[asterisk-users] How to set outgoing sip callid ?

[sean darcy]

Calling linphone from asterisk 13.9.1.:

Dial(SIP/<user>@sip.linphone.org)

And it works. But on the linphone side the caller is:

<extno>@ipaddress

or

2502 at 45.123.987.4

Is there any way to make it more descriptive, at least for the sip user 
name ? I tried setting SIPCALLID, which had no effect.

Set(SIPCALLID=Office)

Thanks,
sean