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Cisco IOS Telephony Service, Version 2.02
Chapter 5 Command Reference
show ephone-dn loopback
Related Commands
Forward Number of digits in the original called number to forward to the other
ephone-dn in the loopback-dn pair.
G711... G711Ulaw64k indicates G.711 codec, mu-law, 64000-bit stream.
G711alaw64k indicates G.711 codec, a-law, 64000-bit stream.
Loopback to ... Indicates the opposite ephone-dn in the loopback pair and the status of that
ephone-dn.
Media IP destination address, if any, for any voice packets that are passing through
the loopback DN
min, max Lowest and highest dn-tag numbers of ephone-dns that are configured as
loopback-dns.
prefix Digit string to add to the beginning of forwarded called numbers.
retry Number of seconds to wait before retrying the loopback target when busy.
srcCallID Internal call reference for the destination.
ssrc RTP synchronization source (SSRC) of the most recent RTP packet.
Strip Number of leading digits to strip before forwarding to the other extension in
the loopback-dn pair.
vector The following values describe the media path for voice packets that pass
through the loopback-dn:
• 0—No media path or not a loopback-dn path (inactive).
• 1—Normal path. Loopback-dn has identified the final media destination
as a local IP phone. The media IP address field shows a valid, non-zero
value.
• 2—Hairpin. Media packets are routed back through paired
loopback-dns. The final destination is not known. For example, this can
be a VoIP-to-VoIP call path by a loopback-dn.
• 3—Hairpin. The final destination is an ephone-dn in a special mode such
as paging.
• 4—Loopback-dn chain has been detected, in which two loopback-dn
pairs have been connected together.
• 5—Loopback-dn chain has been detected in which more than two
loopback-dn pairs are connected in series.
Table 1 show ephone-dn loopback Field Descriptions (continued)
Field Description
Command Description
loopback-dn Creates a virtual loopback voice port (loopback-dn) to establish a
demarcation point for VoIP voice calls and supplementary services.
show ephone-dn Displays status and information or call statistics for one ephone-dn or all
ephone-dns in a Cisco CME system.
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