Specifications

Chapter 1 – Introduction
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 18
Also, please consider that RTS/CTS flow control cannot stop the data stream coming from the
network, e.g.,in a GPRS or fax connection. So the lack of appropriate hardware flow control
increases the risk of losing data packets if, like in the case of UDP, the connection protocol has
no or only minimum error handling functions.
Other network protocols are using high level flow control mechanisms. For example, to prevent
loss of data the TCP protocol uses retransmission algorithms.
1.10 Common PCN Handset Specification (CPHS)
The ME provides features to implement a device following the prerequisites of the Common PCN Handset
Specification (CPHS) Phase 2.
CPHS Feature Description/Remarks AT Command
Alternate Line Service Using two phone numbers with one SIM card. AT^SALS
Voice Message Waiting
Indication
Indicate the receipt of a short message coded as
Voice Message Waiting Indicator as defined by
the CPHS Phase 2 standard.
AT^SIND,
AT+CMER, indicators
“vmwait1” and “vmwait2”
Operator (Service
Provider) Name from
SIM
Read specific Elementary Files (6F14h, 6F18h)
from SIM.
AT+CRSM
Network and Service
Provider Lock
Lock/Unlock an ME to specific HPLMN and
service provider.
AT+CLCK, (AT+CPIN)
Call Forwarding
Get and set diverted call status. Access specific
Elementary File (6F13h) from SIM.
AT+CCFC, AT+CRSM
Customer Service Profile
(CSP)
Setting services and their menu entries
depending on customer profiles.
AT+CRSM
Information Numbers
Hierarchically structured service numbers
phonebook on SIM according to CPHS 4.2
(mandatory).
AT+CRSM