SMS service with Kannel.

Hello,
I would like to set up an SMS service with the Kannel gateway on Ubuntu. I have configured it and it works. I can send SMS to mobile phones. I am using a GSM modem Siemens TC65.
The problem is that when I send an SMS request to the service, I do not receive any response. Please help me.
Thank you in advance. Above is the configuration of my gateway.

#
# THIS IS A SAMPLE CONFIGURATION FOR KANNEL
#
# For any modifications to this file, see Kannel User Guide
# If that does not help, send email to users@kannel.org
#

group = core
admin-port = 13000
admin-password = bar
smsbox-port = 13001
#status-password = foo
#admin-deny-ip = ""
#admin-allow-ip = ""
#log-file = "/tmp/kannel.log"
#log-level = 0
#access-log = "access.log"
#http-proxy-host = "127.0.0.1"
#http-proxy-port = 8080
#http-proxy-exceptions = "127.0.0.1"
#http-proxy-username = "user"
#http-proxy-password = "password"
#ssl-certkey-file = "mycertandprivkeyfile.pem"
dlr-storage = mysql

include = "/etc/kannel/modems.conf"

# Smsbox related
#smsbox-port = 13001
#box-deny-ip = "*.*.*.*"
#box-allow-ip = "127.0.0.1"
#unified-prefix = "00358,0"
#white-list = "http://127.0.0.1/white-list.txt"
#black-list = "http://127.0.0.1/black-list.txt"
#store-file = "kannel.store"

# Wapbox related
#wapbox-port = 13002
#udp-deny-ip = "*.*.*.*"
#udp-allow-ip = "127.0.0.1"
#wdp-interface-name = "*"

# SMSC CONNECTIONS - GLOBAL FIELDS
#group = smsc
#smsc = at
#smsc-id = ID
#denied-smsc-id = "X;Y"
#allowed-smsc-id = "Z"
#preferred-smsc-id = "W"
#allowed-prefix = "040;050"
#denied-prefix = "060;070"
#alt-charset =

# SMSC Nokia CIMD2
#group = smsc
#smsc = cimd2
#host =
#port =
#smsc-username =
#smsc-password =
#keepalive =
#sender-prefix =

# SMSC EMI
#group = smsc
#smsc = emi2
#smsc = emi_ip to use the old implementation
#host =
#port =
#smsc-username =
#smsc-password =
#device = /dev/
#phone =
#our-port =
#receive-port =
#connect-allow-ip =
#keepalive =
#flow-control =

# SMSC SMPP
#group = smsc
#smsc = smpp
#host =
#port =
#receive-port =
#smsc-username =
#smsc-password =
#system-type =
#address-range =

# SMSC SEMA
#group = smsc
#smsc = sema
#device = /dev/tty0
#smsc_nua = (X121 smsc address)
#home_nua = (x121 radio pad address)
#wait_report = 0/1 (0 means false, 1 means true)

# SMSC OIS
#group = smsc
#smsc = ois
#host = 103.102.101.100
#port = 10000
#receive-port = 10000
#ois-debug-level = 0

# SMSC GSM
group = smsc
smsc = at
smsc-id = mysmsc
modemtype = tc65
#modemtype = auto
#modemtype = wavecom | premicell | siemens | siemens-tc35 | falcom | nokiaphone | ericsson
device = /dev/ttyS0
pin = 1234
#validityperiod = 167
sms-center = +22676600150
my-number = +22676431572

# SMSC Fake
#group = smsc
#smsc = fake
#host =
#port =
#connect-allow-ip =

# SMSC HTTP
#group = smsc
#smsc = http
#system-type = kannel
#send-url =
#port =
#connect-allow-ip =
#username =
#password =

# SMSBOX SETUP

group = smsbox
bearerbox-host = localhost
sendsms-port = 13013
sendsms-chars = "0123456789 +-"
global-sender = 13013
#log-file = "/tmp/smsbox.log"
#log-level = 0
#access-log = "access.log"
#white-list =
#black-list =
#reply-couldnotfetch =
#reply-couldnotrepresent =
#reply-requestfailed =
#reply-emptymessage =

# SEND-SMS USERS

group = sendsms-user
username = tester
password = foobar
#user-deny-ip = ""
#user-allow-ip = ""

# this sender is for Kannel relay testing (http_smsc)

#group = sendsms-user
#username = kannel
#password = rL4y
#user-deny-ip = "*.*.*.*"
#user-allow-ip = "127.0.0.1"
#name = service_kannel
#forced-smsc = ID
#default-smsc = ID
#faked-sended =
#max-messages = 1
#concatenation = 1
#split-chars =
#split-suffix =
#omit-empty =
#header =
#footer =
#allowed-prefix =
#denied-prefix =
#white-list =
#black-list =

# SMS SERVICES

#group = sms-service
#name = emploiTemps
#keyword = emp
#aliases = "noppy;niente"
#text = "Operational timetable available"
#get-url = "http://"
#post-url = "http://"
#file = "/tmp/"
#accepted-smsc = ID
#allowed-prefix =
#denied-prefix =
#catch-all = false
#send-sender = false
#strip-keyword = false
#faked-sender =
#max-messages = 1
#accept-x-kannel-headers = false
#assume-plain-text = false
#concatenation = false
#split-chars =
#split-suffix = "+"
#omit-empty = true
#header =
#footer =
#prefix =
#suffix =
#white-list =
#black-list =

# SMS SERVICE GET-URL EXAMPLE
#group = sms-service
#keyword = relay
#get-url = "http://localhost/service?phone=%p&text=%r&binary=%b&smsc=$i&time=%t

# SMS SERVICE black-list
group = sms-service
keyword = emp
text = "You are not allowed to use this service, Go away!"
accepted-smsc = mysmsc

# SMS SERVICE Default
# there should be default always
group = sms-service
keyword = default
text = "No service specified"

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