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Wireless E911 Guide CG-EWCG-001
BellSouth Wireless E9–1–1/SS7 Interconnection
Guide
Issue 3, January 6, 2004
A.11.5 What if I don’t have SS7 signaling "A" link connectivity to support trunking
to the appropriate NDET?
You can order it through your normal BellSouth circuit ordering procedures. See BellSouth TR 73554
Issue D, December 2002 (or later), BST GUIDELINES TO TECHNICAL PUBLICATION GR-905-CORE
for details on the interfaces required to interconnect out-of-band Common Channel Signaling (CCS)
networks that utilize the Signaling System Number 7 (SS7) protocol provided by a different CCS Network.
A.11.6 What do I do for Continuity Testing on these SS7 trunks?
BellSouth encourages the use of continuity testing for 911 trunks using SS7 signaling, with the testing
rate of 100%. We also recommend the use of continuity tone levels of Transmit High - Receive High for
4 wire or digital switches (i.e., 4W4W (5ESS), THRH (DMS-100), etc.). We have no provisions to
deviate from the national standards of THRH if digital, and TLRH if the MSC is a 2-wire analog switch,
which isn’t likely today. If you need any other continuity test, please let your account team know so
that it can be provisioned separately.
A.12 11.0 Attachment "C" - Wireless Customer Checklist
Wireless Customer Checklist (in no particular order):
• Does the MSC have SS7 signaling link connectivity to support trunking to the appropriate
NDET?
• Do we know what call scenario we plan to follow? (i.e. WCM or NCAS WITH the BellSouth
hybrid functionality, etc.)
• Do we know what trunk continuity test levels, and testing percentages that we plan to use?
(BellSouth encourages that the percentage be 100%.) Remember, BellSouth has no provisions
to deviate from the national standards of THRH if digital, and TLRH if the MSC is a 2-wire
analog switch, which isn’t likely today.
• Do we know what TCICs we’re going to use?
• Are the proper Destination and Originating Point Codes identified for the new trunk group(s)?
• Is this group properly ordered as 1-Way, outgoing from the MSC, SS7, with the Mobile Carrier
office as the "A" end, and the BellSouth office as the "Z" end?
• Do we have a testing method to generate a call on the SS7 E9-1-1 group, and a written Call
Through Test Plan to ensure these trunks are working correctly BEFORE we put live wireless
E9-1-1 service on them?
NOTE: This list is NOT intended to be all inclusive of the steps necessary to deploy wireless E9-1-1
service using SS7 signaling.
NOTE: Specific information regarding BellSouth’s point codes may be obtained from each carrier’s
BellSouth’s account team when orders are being placed for SS7 controlled trunk groups.
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