MP-1xx SIP User’s Manual 8. Gateway Capabilities Description
Version 4.4 153 March 2005
• QoS - The QoS of an IP connection is determined according to RTCP statistics of previous
calls. Network delay (in msec) and network packet loss (in percentage) are separately
quantified and compared to a certain (configurable) threshold. If the calculated amounts (of
delay or packet loss) exceed these thresholds the IP connection is disallowed.
• DNS resolution – When host name is used (instead of IP address) for the destination route, it
is resolved to an IP address by a DNS server. Connectivity and QoS are then applied to the
resolved IP address.
8.3.3 Relevant Parameters
The following parameters (described in Table 5-10) are used to configure the Alternative Routing
mechanism:
• AltRoutingTel2IPEnable
• AltRoutingTel2IPMode
• IPConnQoSMaxAllowedPL
• IPConnQoSMaxAllowedDelay
8.4 Working with Supplementary Services
The MP-1xx SIP FXS and FXO gateways support the following supplementary services:
• Hold / Retrieve; refer to Section
8.4.1.
• Consultation / Alternate; refer to Section
8.4.2.
• Transfer (Refer + Replaces); refer to Section
8.4.3.
• Call Forward (3xx Redirect Responses); refer to Section
8.4.4.
• Call Waiting (182 Queued Response); refer to Section
8.4.5.
• Message Waiting Indication (MWI); refer to Section
8.4.6.
To activate these supplementary services (Hold, Transfer, Forward, Waiting and MWI) on the
MP-1xx gateway, enable each service’s corresponding parameter either from the Web Interface
or via the ini file. Note that all call participants must support the specific used method.
Note: When working with application servers (such as BroadSoft’s BroadWorks) in
client server mode (the application server controls all supplementary
services and keypad features by itself), the gateway’s supplementary
services must be disabled.
8.4.1 Call Hold and Retrieve
8.4.1.1 Initiating Hold/Retrieve
• Active calls can be put on-hold by pressing the phone's hook-flash button.
• The party that initiates the hold is called the holding party; the other party is called the held
party.
• After a successful Hold, the holding party hears a Dial Tone.
• Call retrieve can be performed only by the holding party while the call is held and active.
• The holding party performs the retrieve by pressing the hook-flash.
• After a successful retrieve, voice is connected again.
• Hold is performed by sending a REINVITE with the IP address 0.0.0.0 or “a=sendonly” in the
SDP according to the parameter ‘HoldFormat’.
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