[VoiceOps] Broadworks: Preserve sip call-ID

[Jay Hennigan]

On 3/15/12 10:34 AM, Mary Lou Carey wrote:
> The caller ID, LRN, and called number are used to determine the CABS
> billing (minutes of use) in the PSTN world so that's why they don't want
> you to drop callerID. Many VOIP carriers were dropping callerID or
> spoofing it so they could push it down a local trunk group and claim
> they didn't have to pay anything for it (because local is free). The
> recent FCC ruling on ICC reform stated that all carriers (including
> VOIP) are responsible for paying for their intra and interLATA traffic
> and must pass the correct information along so the traffic is classified
> and billed correctly.

SIP call-ID != Caller-ID (CLID).  And both != ANI.

SIP call-ID is an random-ish alphanumeric string identifying a specific
call.  It is supposed to be different for every call and typically
doesn't contain the calling or called number.

Caller-ID (CLID) is a numeric string optionally passed to the receiving
end user purporting to show the originating number.  It is often
manipulated, for example a PBX forwarding an inbound call out a trunk
will often be configured to show the CLID of the inbound call as opposed
to that of the PBX.

ANI (Automatic Number Identification) is used for billing, and can be
mapped to P-asserted-identity in the SIP world.

--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
Impulse Internet Service  -  http://www.impulse.net/
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