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FAQ: Communication Server 1000 (CS 1000)

This document contains the Frequently Asked Questions on Communication Server 1000.

CS 1000 Call Detail Recording (CDR) Toolkit


What is needed to implement intelligent Call Detail Recording (CDR) applications working with CS 1000?

You will need to refer the following documents. These docs will explain how to retrieve the data from the CS 1000:

  • Meridian 1 and CS 1000 CDR NTP's (.zip, 993 KB)
  • CS 1000 Release 6.0 Call Detail Recording Configuration (.pdf, 1.1 MB)

Just to be clear, MLS is not required for development of Call Detail Recording applications.

CS 1000 SIP Interoperability


Does NES Contact Center 7.0 support SIP phones connected to CS 1000?

NES Contact Center does not support SIP lines / phones as endpoints.

NES Contact Center 7.0 most commonly supports three models of telephones in customer CS 1000 deployments:

  • 1150E IP Deskphone
  • 3905 Digital Deskphone
  • 2216 ACD Digital Deskphone
NES Contact Center also supports a the following models of telephones:

  • 2050 IP Softphone
  • 1140E IP Deskphone
  • 1120E IP Deskphone
  • 2002 IP Deskphone
  • 2004 IP Deskphone 2004
  • 2007 IP Deskphone
  • 3904 Digital Deskphone
  • M2616 Performance Plus Phone
  • M2008 Standard Business Phone

What should a third party SIP User Agent (UA) do when receiving a non-standard SIP INVITE from SIP proxy server ?

When receiving non standard INVITE (for example: MINE part in SDP section) the 3rd party UA should reject with "415 Unsupported Media" message back to SPS. CS 1000 SPS will resend its INVITE to the 3rd party UA with a SIP INVITE that includes standard SDP section.

Why is the CS 1000 using 200 OK with SDP section?

RFC 3264:
9 Indicating Capabilities
Before an agent sends an offer, it is helpful to know if the media formats in that offer would be acceptable to the answerer. Certain protocols, like SIP, provide a means to query for such capabilities. SDP can be used in responses to such queries to indicate capabilities. This section describes how such an SDP message is formatted. Since SDP has no way to indicate that the message is for the purpose of capability indication, this is determined from the context of the higher layer protocol. The ability of baseline SDP to indicate capabilities is very limited. It cannot express allowed parameter ranges or values, and can not be done in parallel with an offer/answer itself. Extensions might address such limitations in the future.

Why, in the 200 OK, is the media port in SDP being set to 0?

RFC 3264:
An SDP constructed to indicate media capabilities is structured as follows. It MUST be a valid SDP, except that it MAY omit both "e=" and "p=" lines. The "t=" line MUST be equal to "0 0". For each media type supported by the agent, there MUST be a corresponding media description of that type. The session ID in the origin field MUST be unique for each SDP constructed to indicate media capabilities. The port MUST be set to zero, but the connection address is arbitrary. The usage of port zero makes sure that an SDP formatted for capabilities does not cause media streams to be established if it is interpreted as an offer or answer

What type of DTMF does CS 1000 support ?

In release 5.0 and higher, CS 1000 does support In-band SIP Info and RFC2833 for DTMF. By default, RFC2833 is supported.

Why does CS 1000 send three 183 SIP reponses when 3rd party SIP-based mobile phone is dialing the Call Pilot front end #1 (x3000) directly?

This is how CS 1000 deals with early media treatment in SIP. The three 183 responses are: :

  • 1st 183 is to provide the ringing tone you hear when dial in to CallPilot voicemail system
  • 2nd 183 is to extinguish that
  • 3rd 183 is the voice response from CallPilot voicemail system to announce "Welcome to CallPilot ...." or " Nortel CallPilot ...." or " Please enter your mailbox number ...", etc.

Does CS 1000 support SIP REFER in the call redirection ?

Yes, the CS 1000 supports REFER but will NEVER send/use it. The CS 1000 performs the transfer using RE-INVITES (REFER is a special case for the CS 1000). Technically speaking the CS 1000 handles REFER from the SIP TRUNK level. This is the only scenario in which an INVITE for a local set will be driven out of the CS 1000