Howto:SIPS will work with V7

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Applies To

This information applies to

  • all innovaphone devices with V7


More Information

This information is for future release and describes baisicly how we will implement secure sip.

This information is not confirmed now it is an basic overview how we will implement SIPS.

Secure SIP is a security mechanism defined by SIP RFC 3261 for sending SIP messages over a Transport Layer Security-encrypted channel.

Originally used for securing HTTP sessions, TLS can be repurposed to protect SIP session communications from eavesdropping or tampering.


Key exchange

In an SDP message we will send an attribute like this

a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:fcUai9fK58dEKsmEQp4b5nylUROLpze0jLVyaE5i

This menas that SRTP will be used with AES-128 using a 32 Bit hash and the key fcUai9fK58dEKsmEQp4b5nylUROLpze0jLVyaE5i.

The whole SDP message will be sent encryped via TLS to protect the key.

SRTP

innovaphone will support

AES-128

AES-192

AES-256

all with 32 or 80 bit SHA1 hashed message authentication codes (HMAC).

SIPS

Sips means SIP via TLS - we will implement SIP via TCP and TLS

TLS

innovaphone will support

RSA with 3DES

RSA with AES-128

RSA with AES-256

all with SHA1 hashes.

Certificates

We support X.509 certificates with RSA keys and SHA1/MD5 signatures.

Related Articles

Howto:Certificate management in V7