The following configuration can be used to register with a Skype Connect account.

#--------------------------------------------------------------- #
#                                                                #
# SN4634/5BIS/UI                                                 #
# R6.x                                                           #
# Autor: Thomas Tlapak                                           #
# Date: 03.07.2012                                               #
#                                                                #
# Contact: support@patton.com                                    #
#----------------------------------------------------------------#

cli version 3.20
clock local default-offset +00:00
dns-client server 172.16.20.10
dns-relay
webserver port 80 language en
sntp-client
sntp-client server primary 129.132.2.21 port 123 version 4

system

  ic voice 0
    low-bitrate-codec g729

system
  clock-source 1 bri 0 0

profile napt NAPT_WAN

profile ppp default

profile tone-set default

profile voip default
  codec 1 g711alaw64k rx-length 20 tx-length 20
  codec 2 g711ulaw64k rx-length 20 tx-length 20

profile pstn default

profile sip default
  no autonomous-transitioning

profile dhcp-server DHCPS_LAN
  network 192.168.1.0 255.255.255.0
  include 1 192.168.1.10 192.168.1.99
  lease 2 hours
  default-router 1 192.168.1.1
  domain-name-server 1 192.168.1.1

profile aaa default
  method 1 local
  method 2 none

context ip router

  interface WAN
    ipaddress <Fix IP> <Subnet>
    use profile napt NAPT_WAN
    tcp adjust-mss rx mtu
    tcp adjust-mss tx mtu

  interface LAN
    ipaddress 192.168.1.1 255.255.255.0
    tcp adjust-mss rx mtu
    tcp adjust-mss tx mtu

context ip router
  dhcp-server use profile DHCPS_LAN
  route 0.0.0.0 0.0.0.0 <default gateway> 0

context cs switch

  routing-table called-e164 RT_DGIT
    route .T dest-interface IF_SIP

  interface isdn IF_ISDN_00
    route call dest-table RT_DGIT

  interface sip IF_SIP
    bind context sip-gateway GW_SIP
    route call dest-interface IF_ISDN_00
    remote sip.skype.com
    address-translation outgoing-call from-header user-part fix <username> host-part call

context cs switch
  no shutdown

authentication-service AUTH_SERV
  username <username> password <password>

location-service LOC_SERV
  domain 1 sip.skype.com

  identity <username>

    authentication outbound
      authenticate 1 authentication-service AUTH_SERV

    registration outbound
      registrar sip.skype.com
      register auto

context sip-gateway GW_SIP

  interface IF_GW_SIP
    bind interface WAN context router port 5060

context sip-gateway GW_SIP
  bind location-service LOC_SERV
  no shutdown

port ethernet 0 0
  medium auto
  encapsulation ip
  bind interface WAN router
  no shutdown

port ethernet 0 1
  medium auto
  encapsulation ip
  bind interface LAN router
  no shutdown

port bri 0 0
  clock auto
  power-feed
  encapsulation q921

  q921
    uni-side auto
    encapsulation q931

    q931
      protocol dss1
      uni-side net
      bchan-number-order ascending
      encapsulation cc-isdn
      bind interface IF_ISDN_00 switch

port bri 0 0
  no shutdown

port bri 0 1
  clock auto
  encapsulation q921

  q921
    uni-side auto
    encapsulation q931

    q931
      protocol dss1
      uni-side net
      bchan-number-order ascending

port bri 0 1
  shutdown

port bri 0 2
  clock auto
  encapsulation q921

  q921
    uni-side auto
    encapsulation q931

    q931
      protocol dss1
      uni-side net
      bchan-number-order ascending