Transcript c=IN Bypass ID Assignment Subnet Looked up (Network Subnet Clients) (IP Address Gateways) Site Associated with Subnet Looked up Is the site connected to a region by Bandwidth Constraints? No Bypass ID assigned to.

c=IN
Bypass ID
Assignment
Subnet Looked up
(Network Subnet Clients)
(IP Address Gateways)
Site Associated with
Subnet Looked up
Is the site
connected to a
region by
Bandwidth
Constraints?
No
Bypass ID assigned
to Region Retrieved
Bypass ID issued to
Client\GW
Yes
Site Specific Bypass
ID Retrieved
Bypass ID Issued to
Client\GW
Lync Login Begins
Is the Client
External?
No
Network Subnet
Information
Provided to Lync
Server
Yes
No Bypass ID
Assigned
Is
Media Bypass
Enabled?
Yes
Is Bypass All
Set?
No
Yes
No Bypass ID
Assigned
Global Bypass ID
Assigned
No
Does the Subnet
Match a defined Site
Subnet
No
Is Bypass for None
Defined Sites Enabled
Yes
Yes
Bypass ID for the Site\
Region Returned
Default Bypass ID
Assigned
No
No Bypass ID
Assigned
Client Makes
Outbound Call
Client Bypass ID
passed as part of
Invite
Lync Server,
determines correct
Trunk to utilise,
based on the users
Voice Policy
Is the Trunk
Enabled for
Bypass?
Yes
Does the Trunk
have a Representative
Media IP Set?
No
Trunk Bypass ID
Generated Based on
Signalling IP Address
No
Invite to GW
contains Mediation
Server IP address
for Media
Termination
Yes
Trunk Bypass ID
Generated Based on
Representative IP
Address
Does the Bypass ID
match the client Bypass
ID?
No
Invite to GW
contains Mediation
Server IP address
for Media
Termination
Yes
Invite to GW
contains Client IP
address for Media
Termination
Inbound Call from
Gateway
TLS Call?
Yes
Match to Trunk
Based on Gateway
FQDN and
Destination Port
No
Match to Trunk
Based on Gateway
IP Address and
Destination Port
Media Bypass
Enabled?
Yes
Bypass SDP is sent
to the Client with
Bypass ID, in
addition to the two
SDPs for the
Mediation Server
Client checks if
Bypass ID in
SDP matches
Client Bypass ID
No
Call will not Bypass
Invite sent to clients
containing two SDPs
for Mediation
Server
No
SDP sent from Client
to Mediation Server
Yes
SDP sent from Client to
Mediation Server contains
“a=x-bypass” in Client SDP
Id
If no Bandwidth
Policy is
assigned, the
Site inherits the
Bypass ID of the
Region
Active Directory
(192.168.1.5)
Lync SE
(192.168.1.20)
CUCM 4 MTP
(192.168.2.30)
CUCM 4 & MTP
(192.168.1.30)
Router
(RRAS)
Cisco IP Phone
Mediation
Server
(192.168.1.25)
Lync Client
(192.168.1.150)
Cisco IP Phone
Lync Client
(192.168.2.150)
Lync Branch to
Cisco Head
Office
Lync Branch
to Cisco
Branch
Signalling Path
Non-Bypass Media Path (G711)
Non-Bypass Media Path (RTA or G711)
Bypass Media Path (G711)
Front End
Front End
Call Manager
Call Manager
MTP
MTP
MTP
MTP
Extension
Extension
Extension
Extension
Mediation
Mediation