VTech ET685 Administrator And Provisioning Manual page 157

Setting
Require PRACK
Send PRACK
Offer GRUU
Offer MPO
Use Outbound
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Defines whether Required:100Rel will be send or not. This
influences whether a early-dialog via PRACK will be
established (if the opposite offers this by sending
Supported:100Rel) or not. This could be useful for playing
announcements or music/ring-back-tones during the time
the call is in Ringing-state. Even if set to off, the phone will
still offer 100Rel in the Supported-Header if it sends the
INVITE (is the originator of the call). If B responses with
Required: 100Rel it will send the ACK, independent of this
setting. For preventing sending 100Rel as supported (and
by that sending PRACK) you have to set additionally
send_prack to off.
Enables/Disables sending Supported:100Rel and by this
whether early-dialogs by PRACK will be offered. Enabling
this could be useful if the opposite wants to play
music/ring-back-tone or announcements before the call is
connected.
On -> Supported:100Rel will be send (and opposite could
initiate Early-Dialog by sending Required:100Rel)
Off -> Supported:100Rel wont be send (and opposite gets
no chance to initiate Early-Dialog)
Note:This does not influences whether the phone itself will
send Required:100Rel if from opposite Supported:100Rel is
signaled and by this initiating a early-dialog. This behavior is
influenced by require_prack -> see Settings/require_prack.
This setting is used to toggle the support for GRUU
(Globally Routable User agent URLs) in SIP. When several
phones have the same account, each one of them can be
identified by the proxy through this GRUU ID, which is
unique for each phone and stays the same even after
reboot.
Using this setting, the user can turn the Media Path
Optimization support on or off. Turning it on makes sense
only when you have MPO-supporting session border
controller devices in your environment (e.g., Jasomi).
This setting is used to toggle the support for
draft-ietf-sip-outbound-20. Enable this to force the reusage
of connections, what VTech phones already do. However, in
combination with Offer GRUU the phone will stick to the
network flow created during line registration. Additionally
you have to specify a value for Keep Alive.
157
Back to Contents