2 Mbps is tight but can definitely support 0.1 Mb/s calls. The vendor needs to ensure the phones tag audio packets with EF priority and the router uses a strict

2 Mbps is tight but can definitely support 0.1 Mb/s calls. The vendor needs to ensure the phones tag audio packets with EF priority and the router uses a strict priority queue. (Whenever a voice packet arrives it pauses handling non-voice traffic until the voice queue is clear. This ensures a voice packet is never delayed by more than 1500B / 2 Mbps = 6 ms). https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/5125-delay-details.html#serializationdelay https://www.cisco.com/c/en/us/support/docs/voice/voice-quali...