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Caller ID on Cisco 2600 and 3600 Series Routers and Cisco MC3810 Multiservice Concentrators
Caller ID Overview
VC-812
Cisco IOS Voice, Video, and Fax Configuration Guide
• Service Provider—In traditional telephony, caller ID is a standard service that service provider
customers expect. With the Cisco support for caller ID, service providers can offer the feature for
packet-switched Voice over IP (VoIP), Voice over Frame Relay (VoFR), and Voice over ATM
(VoATM) services.
Calling Name and Number
Figure 130 shows a hypothetical topology where users, indicated by telephone icons, receive different
types of caller-ID support depending upon whether the caller-ID information from the caller passes
through an FXO or FXS port before reaching the party who receives the call.
Figure 130 Caller ID and ANI Support
Table 56 shows how caller-ID information is received by the users in Figure 130 as follows:
• When an outbound caller-ID call is carried by a trunk with E&M or R2 signaling, the recipient sees
only the ANI calling number of the caller.
• When caller-ID information is sent from an originating FXS station by way of the PSTN, the
recipient sees only the identification of the FXO port through which the call is routed.
• When caller-ID information is sent from an originating station over a trunk with E&M or R2
signaling and through the PSTN, the recipient sees only the trunk identification because the ANI
information is not preserved by the PSTN.
User A
User E
User D
FXS
FXS
FXS
FXS
PBX
Trunk
(E&M/R2)
Trunk
Trunk (with ANI support)
FXS
FXO 408 555-1111
408 555-2222
FXO
User B
User G
User C
User F
PSTN
VoIP, VoFR,
or VoATM
VoIP, VoFR,
or VoATM
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