[asterisk-biz] UTStarCom F1000 and AP Roaming

[Julio Arruda]

Cory Andrews wrote:
> Have had a lot of people asking about "roaming"capabilities of current SIP Based WIFI phones.  Here's a clarification using the UTStarCom F1000 as an example.
> 
> Roaming is an ill defined term.  To tell  you what the phones do:
> 
> We would define "ROAMING" in the context of multiple locations.  An F1000 will "roam" from AP to AP with no problems.  If it goes out of range of an AP, it will scan for another one in its profiles. 
> 
> The other item often confused with roaming is hand over.  In that case, the phone will move from AP to AP even while on a call and will maintain the call.  The F1000 will do that if all APs are served from the same access controller and are on the same subnet.  This will not work if an area is covered by multiple AP/Routers (like the Linksys WRT54G's) where each router has a different DHCP server to allocate addresses on its subnet.  The whole DHCP/Registration process takes far too long to manage a hand over.


How would the call stay established if the end-point of the SIP and RTP 
conversations changed midcall ? Would not require some 'inteligence' in 
the UA and possible the SIP proxy ?