1 General Guidelines for SIP Trunking Installations 1) How do I setup my SIP trunk for inbound/outbound calling? We authenticate IP-PBX SIP Trunking traffic by: IP Authentication (IP address) or Digest Authentication (account and SIP password) After you decide which switch platform to use, you will need to establish a SIP trunk with our US proxy server siptrunk.net2phone.com and input your IP address into our portal or register your switch with us. Alternatively, if your switch is not in Central or North America, you can use one of our international POPs to reduce transit delays: For our UK POP point to siptrunkuk.net2phone.com For our HK POP point to siptrunkhk.net2phone.com IP Authentication (IP Address) The IP Authentication method is normally simpler to provision and should be used only when you have a static IP Address. It is also somewhat more secure since your SIP trunk can only be used from the IP Address you provide. With an open source applications (such as Asterisk), you can setup your SIP trunk with IP Authentication as follows: Outgoing Settings: Incoming Settings: [out-1] [in-1] [in-2] disallow=all disallow=all insecure=invite ignoresdpversion=yes insecure=invite insecure=invite host= siptrunk.net2phone.com host= host= allow=ulaw allow=ulaw allow=ulaw allow=alaw allow=alaw allow=alaw allow=g729 allow=g729 allow=g729 * To use our UK POP, where it says host= use siptrunkuk.net2phone.com instead ** For Inbound on the UK POP allow traffic from: * To use our HK POP, where is says host= use siptrunkhk.net2phone.com instead ** For Inbound on the HK POP allow traffic from:
2 If you are using a web-based Asterisk PBX (like FreePBX), IP Authentication setup is slightly different: In "Outgoing Settings", name the section "out-1" Then, in "Peer Detail", enter the following: insecure=invite ignoresdpversion=yes host= siptrunk.net2phone.com allow=ulaw allow=alaw allow=g729 In "Incoming Settings", name the section "in-1" in "User Context". Then, in "User Detail, enter the following: disallow=all insecure=invite host= allow=ulaw allow=alaw allow=g729 After this has been completed, you will have to create a separate trunk. For the second trunk, name the outgoing "out-2" and again enter the following information: insecure=invite ignoresdpversion=yes host= siptrunk.net2phone.com
3 allow=ulaw allow=alaw allow=g729 Then, for the second trunk, name the incoming "in-2" and again enter the following information: disallow=all insecure=invite host= allow=ulaw allow=alaw allow=g729 No registration string is required for IP Authentication. Please make sure to configure your router/firewall to allow traffic from: and for US for UK for Hong Kong In addition, please allow all RTP traffic from any IP Address ports UDP. Digest Authentication (account & SIP Password) On open source applications (such as Asterisk), you can setup your SIP trunk for digest authentication as follows: Peer Detail username= <account> secret= <sip password> progressinband=never insecure=very ignoresdpversion=yes
4 host= siptrunk.net2phone.com allow=g729&g711 User Detail username=<account> user=<> type=user context=from-pstn allow=g729&ulaw&alaw Register String: *For utilizing our UK POP, anywhere you see siptrunk.net2phone.com, replace with siptrunkuk.net2phone.com & for utilizing our Hong Kong POP replace with siptrunkhk.net2phone.com There are several GUI interfaces for Asterisk that simplify the installation process. These interfaces allow administrators to view, edit and change most configurations via a Web interface. Unless you are an advanced Asterisk user, we highly recommend downloading one of the following GUI interfaces: Elastix PBX in a Flash AsteriskNOW On other types of switch platforms, we recommend that you configure your switch as per your vendor guidelines (see Appendix). Please note that we do not provide direct technical support for end user SIP Trunking switch platforms. If your switch is not working as expected, you may need to contact the device manufacturer or vendor for technical support. 2) Which CODECs do you support? We support G711and G729. Generally speaking, we recommend that our customers offer G711 as well as G729 in their initial SIP INVITE to us.
5 3) How do I setup my dialing plan for outbound calling? You can choose a dialing plan when provisioning the account through our Partner Resource Center Web site. If you choose the "Universal" dial plan in the Partner Resource Center, you can then dial in the following formats: Country Code+ Phone Number 011+Country Code+ Phone Number 00+ Country Code + Phone Number. US dialing plans are setup in the North American Numbering Plan (NANP) format of 1 + area code + 7 digit number (for US calls) and country code + number (for non-us calls). The 1 prefix should be used on all US calls. The 011 prefix should be used on all non-us calls. For more information on the NANP, please visit If you choose to setup a non-us dialing plan, you will first have to configure your service account on our Partner Resource Center Web site with the specific dialing plan of your choice. Then you would dial exactly the same way you typically dial from within the country, with local calls being dialed in the way you normally dial local calls in country. 4) Which format should I use when setting up Caller ID in my switch? We recommend using the PAID (P-Asserted-Identity) option for CLI as per RFC Our platform also supports RPID (Remote-Party-ID). For more information, please visit 5) What ports should I open in my router/firewall? For best results please allow traffic from: and for US for UK for Hong Kong In addition, please allow all RTP traffic from any IP Address ports UDP. 6) In what format should I configure the phone number for inbound routes? In order to receive inbound calls, you will have to build an inbound route on your switch and map it to a valid extension or ring group. Please make sure that you have configured the inbound route properly on your switch. Also, please make sure that you are allowing the inbound SIP traffic to pass to your switch from our proxy server (In US siptrunk.net2phone.com and in UK siptrunkuk.net2phone.com). We will send all inbound calls in the North American Numbering Plan (NANP) format of 1 + area code + 7 digit number (US calls) and country code + number (non US calls). This is how virtual phone numbers (DIDs) will display in the Partner Resource
6 Center. You should input the DID in your inbound route in the exact format displayed in the panel. 7) Do you offer location based proxies so I can register with a proxy closer to my location? We currently offer four proxies for registration that will send both SIP and media packets from that location. However, registering with the default siptrunk.net2phone.com proxy will also route media traffic depending on your location. The proxy information and additional IP addresses necessary to clear your firewall are as follows: Location: USA Proxy: siptrunk.net2phone.com IP Address: IP Address: Location: Hong Kong Proxy: siptrunkhk.net2phone.com IP Address: Location: United Kingdom Proxy: siptrunkuk.net2phone.com IP Address: ) Which DTMF settings should I set on my switch? We recommend that you enable RFC 2833 payload type 101 for DTMF. 9) How can I capture a SIP trace on my switch? When setting up a new SIP trunk with a provider or troubleshooting call failures, it's important to be able to capture a signaling trace of an outbound call. This is also important when troubleshooting SIP registration issues with a new provider. In Asterisk, you can activate SIP debugging via the Asterisk CLI using the SIP set debug commands: SIP set debug peer on Turns on SIP debugging globally showing all SIP traffic to and from the Asterisk gateway SIP set debug IP xxx.xxx.xxx.xxx Allows you to debug only to and from a particular IP address SIP set debug off
7 Turns off all SIP debugging If you don't want to enable debugging on your switch, you can use a network protocol analyzer such as Wireshark to capture the SIP and media traffic on your calls. To learn more about Wireshark, please visit This site includes step-by-step videos on how to setup Wireshark on your network. 10) Which protocol do you support for fax transmissions? We support T.38 protocol as well as G711 pass-through for fax transmissions. The majority of our carriers prefer T.38 protocol.
8 Appendix Support links to various switch vendor platforms: Asterisk - Support Forum 3CX - Support Forum Avaya - Support Forum Elastix - Support Forum Trixbox - Support Forum Grandstream - Support Forum Cisco - Support Forums FreePBX - Support Forum Talkswitch - Support Forum AudioCodes - Support Voipswitch - Support IPsmarx - Support Huawei - Support Sonus Networks - Support PortaOne - Support
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