# sRTP relay support for encrypted SIP interconnections

When using SIP TLS, sRTP is also used to encrypt the media. In the case where sRTP is used on both call legs in the PRoSBC, sRTP relay is used.\
Encryption keys are passed from one leg to the other followed by a forwarding of the RTP without modifications.<br>

### References

* [Information on sRTP encoding and decoding](/hidden-pages/support-srtp-encoding-and-decoding.md)


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