Terms and Conditions

General

SIP2SIP is a free service provided by AG Projects B.V. a company registered in the Netherlands, which obeys to the Dutch and EU laws.

The service is designed for testing purposes of the software produced and sold by AG Projects to its customers.

Terms of use

You may use this service for reasonable and legal purposes related to establishing real time communications like chat, audio and video sessions with other users on the same platform or external users serviced by third parties using the same protocols.

You may use the service as long as you do not abuse it. We reserve the right to block or remove any acccount that behaves in undesirable ways. The platform is fine-tuned to accommodate residential users traffic patterns. If your traffic has a different pattern, like having a high density of audio calls, using a PBX with many extensions, calling from multiple devices located in different locations at the same time, using automatic dialers, you may want to chose a different service that is more fine tuned for such purpose. An example of abuse is systematically creating accounts on our platform for usage in third party products.

Data Privacy and Storage Policy

SIP2SIP infrastructure relays and stores information provided by end users between the users. If you are concerned about privacy of your own data and how it is used inside the platform, read below.

As a general rule, no end-users data is shared with third-parties.

General

When using any Internet server based infrastructure, you should not expect your information to remain private. Everything that goes through a server is subject to forces outside the control of the clients using it. So you may safely assume all data exchanged through the server is compromised by design. If you care about privacy of your data you should find clients that reveal as less data as possible, then encrypt all the data that is possible to encrypt and never share the private key used to encrypt data with anyone. Still, no matter what client technique you are using, it is impossible when using a server to completely hide when communication takes place, between which account takes place and the source IP addresses of the end-points.

Accounts

SIP2SIP accounts and related information are stored in the platform database. Passwords are stored in an encrypted form in the database. There is a salt involved but in case of the database being completely compromised the salt can be also retrieved. It is advisable to use strong passwords that cannot be guessed by dictionary brute force attacks.

Account Deletion

You can request deletion of you account. We will delete your account providing that no commercial services has been purchased (e.g. credit to call to PSTN network). If you did make a purchase, we are required by law to keep records of all monetary transactions like full name and addresses for up to seven years after purchase.

Signaling

Signaling can be done in clear text using UDP and TCP protocols. You may use TLS for encrypting data between the end points and platform SIP and Web servers. There is no guarantee that encryption will work end-to-end, the SIP signaling part of the platform provides only hop-by-hop signaling security, any intermediate hop may decide to switch from TLS to a non-encrypted transport like UDP.

Sessions

All SIP signaling for session establishment (INVITE/BYE/CANCEL/PRACK/ACK SIP methods and their replies) relayed by the platform SIP servers are stored in cleartext for several days in the platform databases. Both end-users and the platform operator have access to this information for troubleshooting purposes.

Registration

No registration information (SIP REGISTER method) is stored in the platform.

Subscriptions

No presence dialogs (SUBSCRIBE/NOTIFY methods) and related XML payloads are stored in the server databases. Short logs about which device or subscriber changes its presence state are stored for troubleshooting purposes.

Call Detail Records

Call Details Records (CDRs) are stored for up to several months in clear text format in platform databases. CDRs contain metadata information about who called whom and what time and for how long. The IP addresses used for signaling and media are also stored in the CDRs.

Offline Messaging

Text Messages

Messages sent using SIP MESSAGE method that cannot be delivered to local users of the platform are stored for later delivery in cleartext format in the platform database.

Voicemail

Voicemail message are sent un-encrypted over email as attachments and stored un-encrypted on the server voicemail server (optional). Voicemail can be enabled/disabled for each SIP account.

RTP Media

RTP streams are relayed by media relays running on the platform. The actual data is not stored anywhere. You may encrypt your data using SRTP but when using SDES method supported by most devices, the encryption keys are available in cleartext in the SIP signaling. Whomever has access to the signaling plane (and all SIP servers in the path always have access to it) will be able to decrypt any SRTP encrypted stream using SDES key exchange. The alternative is to use zRTP, where the keys are known only to the end-points.

MSRP Media

Chat Messages

MSRP chat sessions are done over TLS connections via the platform MSRP relay servers. The content of the messages is not logged or stored anywhere.

Users of Blin application can replicate the chat messages between multiple instances configured with the same account. The replicated chat messages are stored for 60 days in encrypted form in platform databases. The encryption key is not known by the server, only Blink clients posses the encryption/decryption key. If you are concerned about privacy you may disable chat replication in Blink.

File Transfers

MSRP file transfer sessions are done over TLS connections via the platform MSRP relay servers. The content of the files are not logged or stored but the MSRP relay component sees their content during the transfer.

XMPP Gateway

All chat messages and presence payloads are relayed through the SIP/XMPP gateway. Message content is not stored anywhere.

Protecting Data and Privacy

To minimise the chance of your SIP sessions and media being exposed do the following:

  • Use SIP addresses that do not reveal your real name
  • Use ICE NAT traversal in both end-points, this way RTP streams can flow most of the time peer to peer without passing through the server media relays that can be tapped
  • Use zRTP encryption, this way you will know about men in the middle attacks trying to intercept and decrypt your data
  • Don't use SIP MESSAGE method for chat messages as all message go through the signalling, which is always compromised by design when a server is in the middle
  • Use end-to-end encryption mechanisms like OTR when using MSRP chat
  • Use anonymization services to protect/spoof the real IP source of the client. This howvere just adds one level more of obfuscation, somewhere in the anonymization network the real IP used can be traced

Illegal Intercept

To protect your data against being exposed over the Internet (like IP tapping), do the following:

  • Use TLS for SIP signaling (this will encrypt signaling between client and server)
  • Use zRTP for audio and video (Blink and Jitsi clients support zRTP)
  • Use TLS for MSRP media
  • Use OTR for Chat media (Blink client supports OTR)

These would protect your data against those who try to illegally sniff your network traffic (like breaking into your LAN/WiFi) but have no access to the client or server software. These measures will not protect your data privacy against legal intercept measures if enforced and applied to the server infrastructure that relays the messages (you will likely not know if and when this happens).

Lawful Intercept

In case any entitled government agency requires access to the meta-data stored by SIP2SIP infrastructure, all SIP account data stored on the server can be considered compromised. Use client side encryption to mitigate this risk.