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IP Telephony and QSIG Over IP
Pre-installation Guidelines
9-2 Strata CTX I&M 06/04
Client Firewall Considerations
When installing a CTX with IP, you need to obtain information about your client’s firewall.
❐ Will the client allow you access through their firewall? If not, you will have to configure
around their firewall.
In case of providing services like packet filtering by setting a firewall between the
terminal used for the “IPT Anywhere” environment and the BIPU-MIA interface, you
need to prepare an appropriate setting that allows IPT control signals and voice signals to
penetrate the packet filter and other features of the firewall.
❐ If your clients are using Zonealarm® and Microsoft Windows XP®, you have to enable
the following:
• COM surrogate: access to trusted & Internet
• Generic Host Process: access to trusted & Internet
• Microsoft Distributed Transaction Coordinator (MS DTC) console program: access to
trusted & Internet AND access as a server to trusted & Internet
• Internet Information Services (IIS): access to trusted & Internet
• Windows Management Instrumentation (WMI): access to trusted & Internet
Dos and Don’ts for Setting Up the System
CTX IP Telephones and Strata Net are not compatible with older CTX line cards. If IP Telephones
access any of the line cards listed below, the user will experience unacceptable echo return loss
and voice quality. For best speech quality we recommend using the appropriate CTX cards for
CTX IP telephone connections.
Make sure that you have Printed Circuit Boards (PCBs) that are compatible with CTX R2.0 and
higher software and the IP telephones.
• Do not use – RCOU1A, RCOS1A, REMU1A (two-wire), RDDU1A, RGLU1A, RGLU2A
• OK to use – RCOU3A, RCOS3A, REMU1A (four-wire), REMU2A (two-wire/four-wire),
RGLU3A. and RDDU2A.
• Must use VPN for remote IP telephones that connect over the Internet with BIPU-M1A.
• With the BIPU-M2A, the IP telephone will now work with DSL and cable routers.
When connecting remote IP telephones to the BIPU-M2A over the Internet, a VPN router is
needed to circumvent Network Address Translation (NAT) and firewall issues by tunneling.
Otherwise, the BIPU-2MA must be configured with a public IP address outside the network
firewall. See “IPT Anywhere” on page 9-13.