Nokia N9HR, Manual

Page: 8 / 19

27/08/2019 8 © Nokia 2019
Drawn by N. Rao
S8HR
– EPS bearer may have multiple IMS sessions
• Separate GTP tunnels are used for
IMS signaling and media bearers.
• However, a given bearer may have
multiple IMS sessions or IMS session
legs.
eNB
SGW-U
PGW-U
HPLMN VPLMN
P-CSCF
IMS-
AGW
VoEPS
UE
IMS Session 2
IMS Session 1
Media for IMS Session 2
Media for IMS Session 1
EPS Bearer for IMS Signaling
EPS Bearer for Media
Party-2
Party-1
VoEPS
UE
IMS Session 1
IMS Session 2
1
2
EPS
Bearer
for IMS
signaling
EPS
bearer
for IMS
media
IMS Sessions
(or session legs)
SGW-U