Q. In SRVCC scenarios, what media plane adjustment is done?
a) MEGACO reassigns IP addresses
b) PCRF creates a new bearer
c) RTP flows are redirected from IMS to CS domain
d) SIP is re-negotiated mid-call
Check 🔎
Correct answer: Letter c.
In SRVCC (Single Radio Voice Call Continuity) scenarios, when a VoLTE call is handed over from LTE (IMS) to a legacy CS (Circuit Switched) domain like 2G/3G, the RTP (Real-time Transport Protocol) media stream is redirected from the IMS core to the CS network.
- The ATCF/ATGW handles this media redirection.
- This allows the ongoing voice session to continue seamlessly despite the radio access technology change.
Q. In SRVCC scenarios, what media plane adjustment is done?
a) MEGACO reassigns IP addresses
→ Incorrect. MEGACO (H.248) is used for control between MGC and MGW but does not reassign IPs in SRVCC context.
b) PCRF creates a new bearer
→ Incorrect. PCRF (Policy and Charging Rules Function) deals with policy enforcement and QoS but isn’t responsible for the media path redirection during SRVCC.
c) RTP flows are redirected from IMS to CS domain
→ Correct. The core media path shifts from IMS (VoIP over LTE) to CS (circuit-based voice) during SRVCC.
d) SIP is re-negotiated mid-call
→ Incorrect. SIP re-negotiation is not performed; instead, SRVCC triggers control and media redirection procedures without a SIP UPDATE or re-INVITE.
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